It highlights the current room when you go to the map in case you don't
know where it is.

It now displays that you can right click to set a new size.

This is now skipped if you open the level which is already the most
recently opened one.

This enables you to open those levels even faster (up+enter to open the
last opened level)

The "Are you sure you want to quit?" dialog is now replaced by a dialog
that only shows up if there are unsaved changes. You can choose to save
the changes, discard them, or cancel. (If you save, you can still change
the filename to save as)

This uses the undo and redo stacks to know whether or not unsaved changes
were undone or redone.

I also added an asterisk indicator in the window title to indicate unsaved
changes.

Most operations affecting rooms can now be undone and redone, including
changing room metadata (tileset, platform and enemy bounds, roomname, etc)
and rotating a room 180 degrees. I still need to make sure it works for
pasting, copying and swapping rooms from the map, and maybe some other
things I forgot about.

It can now keep track of all entity changes, and undo/redo them properly.
Also, when undoing/redoing tile placement, gravity lines will now adapt to
the changes.

This is the start of improving the undo system by allowing any change in
entity data and room metadata to be undone and redone as well.

You can now see keyboard shortcuts for most buttons by holding F9
anywhere within Ved.

Also added a testing state to test the tiny font, and added a
highlighting box to the hidden state 7 (sprite listing)

Lines with the X formatting code will automatically convert any XML/HTML
entities to regular characters. That way, it would be possible to add
arbitrary (possibly unsafe HTML) content to the update notes (by
htmlspecialchars()ing it), without risking XSS if anyone visits (or is
persuaded to visit) the update checking page in their browser.

Two very fine additions, I must say.

It doesn't show subdirectories, however.

Unfortunately, Mac's ls doesn't have --group-directories-first, breaking
the Linux-specific variant I thought I could use, so now only level files
are shown on Mac, unless enough people want me to write a Mac-specific
function in order to be able to show and navigate subdirectories.

wget actually supports SSL, and why not have that where possible?

If you choose to only show used or only unused scripts in the list of
scripts, then you'll see the amount of scripts that are shown.

Also moved strings from devstrings.lua to language files.

Because it can be a working link now

Now you can see note scripts, temporary debug scripts or otherwise unused
ones, or specifically filter them out.

Closes #9.

Links can link to:
- Other articles/notes
- Anchors (any line with the # formatting code) in either the same
  article/note or other articles/notes
- Websites

The displayed text for the link can be customized and colored, but when
hovering over it, the destination is shown.

This allows for complete index tables (I added an index table to the
"Lists reference" help article for all the different lists) and of course,
links to websites.

https://i.imgur.com/V7Glt2s.png

I'll type all the details and the ways of using it later

The info includes full plugin names and authors as given in the info file,
whether it's actually supported (by minimum version number), how many
failed file edits there were, the hooks the plugins use, and the files
edited by plugins. This can help in case a certain plugin caused a crash.

Update notes are basically help pages that come along with the update
check, so it'll be possible to show things like the current changelog in
Ved. (And it'd be possible to show what has changed in versions newer than
yours, which would be really nice)

Automatic saving of crash logs saves information about crashes to file,
including and limited to the information that is displayed on the crash
screen, the time, whether debug mode is enabled, whether it was saved
because it was enabled or because the settings haven't been loaded yet,
and a traceback. This can be useful in case the crash screen crashes, the
traceback is needed, the info is needed after closing the Ved with the
crash screen, or for sending more info about a crash to me. Maybe I'll
implement a button to allow people to send a crash report to me if they
press it. Automatically saving crash logs to files can be disabled in the
settings.

Also, the crash screen now also displays the time since Ved was started,
which could be useful to get a quick impression of whether the error
occurred while starting up or later.

They're not officially documented yet. + expands the background color to
the end of the line, = adds an underline to a header on the next line.

It used to use the full path. As described in commit
38dd9c9c, quoting the entire path to
prevent issues with spaces in the path is, bizarrely, invalid syntax via
io.popen, but if you leave them out, you're gonna have problems if your
username contains spaces, or if you happen to still be using Windows XP
(hello again, "Documents and Settings").

Using %appdata% solves this problem.

The name in the backup file was made to contain __ as a substitute for
directory separators, but I forgot to do that with the names of the
containing folders.

There's now a cache for the different colored parts of each line, so the
possibly intensive task of splitting now no longer happens every time the
line is drawn.

This also very much optimizes the Tiles note in a version of open2v2 for
me, which uses more than a dozen different colored parts on several lines.
It used to be rendered at about 20 FPS for me, now it also does it at a
solid 60 FPS.

(Oh, and that's with vsync, if I turn vsync off then Changelog renders at
250-485 FPS, and Tiles renders at more than 300)

Offscreen lines are not rendered anymore (except up to 1024 pixels above
the top of the screen, to allow for high images to not suddenly disappear
as you scroll down).

This makes the changelog note in a version of open2v2, which has more than
1600 lines and uses ¤ on most of them, render at 60 FPS for me, up from
about 32.

Next, I'll try to optimize the parsing of lines which have many different
colors on that one line, which also really needs to be done.

This should make it less likely that I accidentally package a version
marked as an intermediate one for release.

See my comments at http://ved.idea.informer.com/proj/?ia=113714

I mean, they weren't even supposed to be committed.

"foreign files" means files that don't seem to be backup files, but rather
anything like "New text document - copy (76) - copy.txt"

Oh, and also added an indication for these files in the backups list.
They'll now be displayed with their actual file name (instead of having
both dates as 1970 because they weren't matched in the filename) and a
question mark symbol.

APPARENTLY it has been saving the last modified timestamp of overwritten
files as 1970 all along on Windows?

Another secret inconsistency between command prompt windows (or terminal
windows because Linux tools also aren't always consistent) and running
something from within a program. Apparently you can put the full path to a
program you want to run between quotes **in a command prompt**, like this:

`"C:\Stuff\program.exe" arg1 arg2`

but then somehow if you run that very same line from within a program,
that is a syntax error. Why on earth?

So basically, not a huge deal, but apparently, all "originally last
modified" timestamps have been saving as 1970.

This commit also fixes behavior when the overwrite_backups directory
contains non-backup files, but the above thing required a lot more
explanation.

That was pretty necessary.

That is, the menu on the right, and the small 32px wide bar on the left IF
in smaller screen mode. The normal menu on the left side (when not in
smaller screen mode, or when expanded in smaller screen mode) already had
this background, which normally (outside of smaller screen mode) wasn't
visible, because it's transparent black on black, except when using a
larger cursor. The aforementioned areas now have that background as well,
so that when using larger cursors (especially in manual mode, or when
stamping) it's better visible which tiles are outside of the room.

Also, apparently I accidentally added carriage returns to specifically the
license, which I haven't touched. ¯\_(ツ)_/¯

Should've done that with the previous commit, but I forgot.