Mupen: updated core to hg-6efa07cf507c

Core state parameters M64CORE_STATE_SAVECOMPLETE and
M64CORE_STATE_LOADCOMPLETE were added which should assist in callbacks
for implementing state saving/loading
Add support for searching XML cheats database
OECheats: avoid overwriting multiple cheats
OECheats: automatically add menu items for found cheats
OS X likes the ellipsis character. Me too.
OECheats: add support for enable/disable cheats via menu and only parse XML once
OECheats: support adding cheats from the menu
Better path handling for SNES9x
Disable Oops snapshots on SNES9x
ACTUALLY turn off Oops snapshots
Gambatte: enabled cheat support
Major refactor of the device handling and button reporting.
Cleanup tooltips.
Converting defaults for SMS and Xbox360 controller and make defaults work in system bindings.
Gambatte: infer cheat type if unknown
Nestopia: enabled cheat support
Scale Popout Gameplay Window proportionally. Fixes #439
Update Controller-Database for PS3 analogs
Calculate grid LIVE! Fixes #510
Remove unnecessary call