Fix off-by-one comparison in FS_GetFileListExt_
Use linear lerp for dual quaternions with respect to podality
added SDL2 source code (2b2cfda26085)
SDL2 framework for OS X (2b2cfda26085)
removed old SDL.framework
FindSDL2.cmake
sdl2
Returning gamma ramp support
actually some mac platform specific files are now pure C files
Backport from racesow: use old pmove velocity for teleport
Merge pull request #128 from stopiccot/SDL2

SDL2 for OS X
clang-format