Initial gpsp support.
Added de-optimization fix for 256mb RPis for gpSP.
Fixed empty if for 512mb in gpSP.
Added include fix for gpSP.
Changed GBA core to GBA emulator (gpSP) in menu.
Fixed gpSP es_systems.cfg path.
Merge pull request #156 from Aloshi/master

Replace GBA core with the gpSP emulator