AEPgb v0.89.2

We have released a new version of our Gameboy emulator written in Java. Here are the changes:

- Replaced opcode-classes by switch-case block and fixed timings (baka0815)
- Fixed Soundstatus register, Zelda Oracle Of Ages / Seasons now boots the intro (and crashes then) (XTale)
- Added two speed increasing patches submitted by Christian Ullenboom (thanks a lot!) (retroK & XTale)
- Added an about dialog (retroK)
- Added screenshot function (usage: F5 key) (XTale)
- Added extension .sgb for loading roms (retroK)