Ultimate Amiga

Audio done, version bumped to v2.0 Beta 4.
There are some odd music players in games that cause some things to sound weird, I cant fix all until people betatest and report. So once GUI is done, I will release beta.

Now on to GFX backend. PSP GU is pretty cool. So dumping SDL is best move as all the stuff source currently does can be done on GU, with no speed cost to main emu. I have kept standard sharp and smooth display filters, but going to add scanlines and aperture filters. Will also look at adding masks for 4:3 modes.