New SMSAdvance after nearly a year, mostly fixes for the SG1000.
*Optimised tile rendering for mode 0 & 2.
*Fixed a bug where GG games set the "lock-toprow" bit (Sonic Drift demo).
*Added support for the SG1000 games Mahjong and Home Mahjong.
*Added support RAM on some SG1000 games (The Castle, Othello...).
*Fixed clearing of SMS VRAM when no bios used.