Quick fix for a small UI error overlooked since 2015

I made very minor adjustments to the sides of the image to make it scroll more seamlessly.

The following 10 backgrounds have been removed:
Brick, Night, Seasonal, Bathhouse, Showers, Green Screen, Club, Library, Arcade and Hall.

There are 14 remaining backgrounds in the game.

The old default background is now background 24: "Classic".

After several years, we're finally bringing SPNatI home.

I hope you all had a dark and spooky Halloweek!

Changes all alternate character costumes to their normal outfit, and moves all alternate character costume images in the saves/reskinned_opponents folder.

- Changes costumes for Rinkah, D.Va, Pit, Raven and Weiss. (RagnaRinkah is coming later this week)
- Changes the order of the roster
- Defaults the Haunted Forest background
- Adds a few targeted lines from Zone-tan towards the White Raven costume

Backgrounds 8, 12, 13, and 14 don't seem to be PNG files; instead,
they are JPEG files with a PNG suffix (for some reason).

Move layer and epilogue icons to img/ and hide player images instead of setting their src to opponents/blank.png. Why use blank images.

Now it should finally work... hopefully.

- Adds a new background: "Romantic"!
- Adds an epilogue to Zone-tan!
- Adds an alternate outfit to Zone-tan: "Zone-tan Valentine"!
- Defaults Ruby and Weiss' V4 outfits

The new background will be defaulted for the week, along with Ruby, Weiss, Zone-tan and D.Va's alternate outfits and their corresponding dialogue.

- Removed Lilith and Tracer, as they are not currently on the main roster.
- Added some newer characters.
- Reduced the total number of sets by two.

Chara is currently not in the online version

As per new images by BlueKoin

- At the time of removal, Lara had only 157 unique lines, not meeting
the 180 requirement to be put on the testing tables or the 200
requirement to get on the main roster.
- Like all offline_opponents, Lara is welcome to rejoin the game through
the same process that a new character with 180+ lines follows: testing
tables, sponsorship, readmission to main roster.
- Removed Lara's title screen "candy" images for the duration of her
absence.

- Lilith still had her old tattoos in these start screen images.
- Added two new groups. To avoid previewing too much, I've added one
fully dressed image each of eight characters: Twilight, D.Va, Moon,
Nagisa, and the RWBY girls. Their means that their appearance rate will
be rarer than characters with four images each, but they'll still be a
possibility.

Artist: throwaway927263
This image might need to be wider.

To credit the artist of the bed in this background image, I added
his/her name to the Credits button. The Credits description should be
expanded if possible..

Reference link: https://www.reddit.com/r/spnati/comments/6ljfo4/new_background_in_da_club/

Author/artist: DrankeyKrang