v1.13
- Added support for UTF-8 for international text display and text edition/input (if the font supports it).
- Added sample "M+ font" by Coji Morishita in extra_fonts/ to display Japanese text.
- Added IO.ImeSetInputScreenPosFn callback for positioning OS IME input.
- Added IO.FontFallbackGlyph (default to '?').
- OpenGL example: added commented code to load custom font from file-system.
- OpenGL example: shared makefile for Linux and MacOSX.