(SDL2) Added video driver
(SDL2) Add input driver
(SDL2) Fix pixel format detection
(SDL2) Added joypad driver
(SDL2) Fix rumble and implement joypad hotplug
Add SDL2 to feature list
(SDL2) Fix uninitialized var in sdl2_video.c
(SDL2) Use sdl_audio.c as audio driver
(SDL2) Attempt to fix missing events issue
Add SDL2 to Makefile.win
Merge pull request #867 from heuripedes/sdl2

SDL2 video, audio, input and joypad drivers