Initial SDL2 renderer impmlementation work.

comptime.sh

src/Makefile

src/Makefile.cfg

src/m_misc.c

src/sdl2/IMG_xpm.c

src/sdl2/MakeCYG.cfg

src/sdl2/MakeNIX.cfg

src/sdl2/Makefile.cfg

src/sdl2/SDL_icon.xpm

src/sdl2/SDL_main/SDL_dummy_main.c

src/sdl2/SDL_main/SDL_macosx_main.h

src/sdl2/SDL_main/SDL_macosx_main.m

src/sdl2/SDL_main/SDL_openxdk_main.c

src/sdl2/SDL_main/SDL_win32_main.c

src/sdl2/SRB2CE/Makefile.cfg

src/sdl2/SRB2CE/SRB2CE.zip

src/sdl2/SRB2CE/cehelp.c

src/sdl2/SRB2CE/cehelp.h

src/sdl2/SRB2DC/.gitignore

src/sdl2/SRB2DC/IP.BIN