corrected peek color and peek z to correctly emulate real hardware formats.
implements native gamma correction.(i don't own any game that uses this functionality so i will appreciate feedback)
i need a lot of feedback in this changes please
enjoy
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6664 8ced0084-cf51-0410-be5f-012b33b47a6e