v1.10
- User can override memory allocators by #define-ing IM_MALLOC, IM_FREE, IM_REALLOC,
- Added SetCursorPosX(), SetCursorPosY() shortcuts.
- Checkbox() returns true when pressed.
- Added optional external fonts data in extra_fonts/ for reference.
- Removed the need to setup IO.FontHeight when using a custom font.
- Added comments on external fonts usage.