There is apparently no need to maintain this, since in-game switching to
fullscreen appears to do exactly the same, even if a device has no
window manager running, e. g. for Wayland.

Reverts parts of 53dc5558

another take at #1977

Co-authored-by: K1ngst0m <kingstom.chen@gmail.com>

* Updated paths to libpng for macos

Using CMAKE_THREAD_LIBS_INIT might not work on some platforms because
pthreads might be provided as a part of a system library, which would
leave this variable empty. Instead, use the Threads::Threads target
that will correctly be set on these platforms.

Parts of this cmake has been moved to
other cmake files which are included in
the main cmake.

- Validations.cmake for critical validations,
resulting in cmake failures if not passed

- FindDependencies.cmake for 3rd party depencencies
of which I wasn't sure how to extract them into
functions (e.g. too many variables to retain)

- IncludeBeforeProject.cmake for everything that
needs to be done before calling the project command

Other pieces has been refactored into functions
which can be found in Helpers.cmake.

Further refactor might be needed but for now
it looks little bit less messy than before.

Only serving what we will have soon for now.

this support is a runtime terminal environment, not a build time thing
we should dynamically detect support which can be overridden by a config/arg option

otherwise most debuggers can't display the context or don't even work

brings the number of hardcoded build paths to 0 for me

helps with uses of __FILE__ and similar, which now only print the base name

with this we go from over 1k to 45 hardcoded build paths in the plugins and 1
in the binary

Interface now directly consumes the settings struct

it has an embarassing amount of false positives reported already:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97048

Just a QoL thing for people using ccmake or IDEs such as VScode's cmake
extension. Options show up on the list of cache variables to be turned on and off.

Still defaults to disabled, so behavior is unchanged

This reverts commit 28fa4306.

nope, wasn't this

fixes #1790

Initial changes required for running on Anbernic devices.

* Disabled SDL Joystick api as it conflicts with gptokeyb.
* Added resolution scaling changes

The changes I have made are for the following purposes:
- The game is run with a companion program that listens to the handhelds gamepad and translates it into
keyboard/mouse events, this allows more fine grained control and better portability between
devices/platforms. GemRB currently listens for the same events and is doubling up events, i have added an
option to disable the sdl controller api inside of gemrb. (-DSDL_DISABLE_CONTROLLER_API)
- The last option is to fix resolution independence on devices with higher resolution screens. These devices
do not run with an x windows server so the current fullscreen/windowed code doesn't scale up the screen
resolution. (-DSDL_RESOLUTION_INDEPENDANCE="ON")

This should reduce the time wasted in #1692 a little. This
makes the compilers take a way faster sqrt implementation than
the precise default, that has accounted for some time lost there.

Yet, the issues needs some more attention and remains open as of now.

GNU + Clang work without any further tweaks. This may enable `gprof`
on Windows. MSVC has not been examined here.

mainly to enable function inlining from distinct TUs (among other optimizations)
the reason for this is so we don't need to define function implementations in header files in order to benefit from inlining
and thus have the option to speed up compile time by moving such definitions into cpp files (tho LTO itself adds a cost, so YMMV)

only enabled by default in release builds, can be set/disabled manually for any build type

should fix #1702

so it doesn't have to be manually specified

requires SDL2.framework @ version 2.23+

you may build using cmake -DSDL2_DIR=/Library/Frameworks/SDL2.framework ..
to force cmake to select the framework over another SDL install (eg brew install sdl2)

fixes #1329