Prepare cmake support SDL2 and drop SDL1.2 support
Remove video functions that are doublon of SDL2 features
Add explicit cmake modules to find SDL2
Fix header search path
Remove wide fullscreen modes
Change KeyboardKey enums to match the corresponding SDL Keycode
Disable key repeat with SDL2 way
Use a bool to know if Keyboard events can be repeated or not. If true, delay and interval are set from the OS settings
InputEvent now compile