SMS

Added support for loading Master System BIOS files (Fabricio Breve).

Fix lightgun position calculation for vertical aim (Fabricio Breve).

VDP: Fix legacy modes (Super Boy I/II) while maintaining Mode 4 compatibility (Fabricio Breve).

Sega SC-3000 and SK-1100 Support (Keith Conger).

Gear to Gear Link Cable Support (Keith Conger).

Add more mappers (Fabricio Breve).

Implement savestates (Fabricio Breve).

Updated framework.