This is an artifact of the last commit that I was using because I had
misunderstood the meaning of the stride argument for the array
pointers.

This should introduce a minor performance boost for slow CPUs in
OpenGL mode. If it doesn't, it shouldn't be any slower. It also puts
us a little closer to supporting GLES as well.

This introduces several new pgl function pointers that are from
GL 1.1. I do not check for their existence because no driver out in
the wild in active use doesn't support 1.1.

Synchronizing new CMake improvements with OpenGL cleanup branch for
ease of development.

In-source builds are pain and suffering and I am going to stop people
from doing them to save them that pain.

It still won't compile correctly. But this should avoid the error
messages related to it.

This fixes generation with USEASM enabled.

Core and SDL2 are two separate targets now. Core is a static library
that is linked into SRB2SDL2. The sources for both are separated.
When using an IDE like Visual Studio or Xcode, the source code
organized into groups that explain what that group of sources does.

In the future, "Main" could be split into a few more groups based on
file prefixes, but I think the way it is set up works for now.

Makefile targets are not affected by source_groups and typing `make`
will automatically compile both the "Core" library and SRB2SDL2
itself.

All the effort I've made to research into what exactly this is has
been moot. Since we really only need to target GLES and GL, we should
just worry about supporting those. Our public builds don't rely on
this at all. This helps readability in the OpenGL code.

Honestly, under no circumstances when GL is compiled into the game
should the PostImgRedraw not be available. Removing this helps
make the GL code slightly more readable.

The rationale for this is that MiniGL hasn't been relevant for 17
years or longer. Removing it helps cleanup this horrifying section of
the codebase.

This possibly breaks upscaling in fullscreen in OpenGL mode.

Only when actually making the debug target though!

Tested to work on MSVC, mingw-gcc

Enables ASM-NASM and adds tmap*.nas to sdl target.

No idea if this actually works.

snprintf is now available in MSVC 2015!

this is done as a POST_BUILD step

wow i'm stupid

on non debug, check assets folder in src as well

string.c, capitalization, find fixes

silently fixing a bad malloc here too shhhhhhhhh

Generates zips only at the moment

running is another story

Also support dynamic/static opengl switching

It is really messy at the moment. There is no support for copying the
necessary frameworks and dylibs out to the bundle for distribution, and
it is a frankenstein of manual find_library and find_package which can
sometimes pick up Homebrew dylibs.