Added most of SDL_events.h. Missing only a lot of Event Strucutures for Joystick and Controllers. OpenGL Creation and window running has been tested to work.
Updated Libraries to r7291
Merge branch 'develop' into feature/SDL_events.h
Added SDL2Scancode from SDL_scancode.h.
Added enums from SDL_keycode.h
Added functions from SDL_keyboard.h and a struct.
Merge branch 'develop' into feature/SDL_events.h
Added Keyboard event structure back. TODO: Joystick, Controller & Gesture
Merge branch 'feature/SDL_events.h' into develop