SDL_TextEditingEvent and SDL_TextInputEvent text accessors.
Renamed lib subdirectories.

raw => sdl2-raw
types => sdl2-types
Starting on the sdl2 module proper.
Nice window bindings.
Some nice event function bindings.
Added types and raw bindings for SDL_RWops.
Fill in some missing event/touch raw bindings.
More nice event and touch bindings.