Changes:
CODE: Switched to zlib/libpng license.
GUI: Cleaned up input configuration dialog a bit.
INPUT: Added ability to calibrate joystick devices.
VIDEO: Added Blargg's 'nes_ntsc' as a selectable blitter (palettes are not supported).
VIDEO: Removed support for image offset/zooming (as these features were never used anyway).
VIDEO: Renamed 'light_adjustment' to 'brightness' and changed it's absolute range from 63 to 100.