Update picodrive submodule
Only send systemIdentifier string to sizeOfROMHeaderForSystem lookup
Add support for game info lookups on filename-dependent systems (Arcade)
Update Nestopia submodule
Set default SNES core to Higan
Add Pixellate.cg shader. This should alleviate the pixel unevenness in #732

Can potentially make this the new default filter
Replace ddx/ddy functions from Pixellate.cg so it works on all GPUs. Thanks @hizzlekizzle
Set Pixellate as default filter
Update TwoMbit submodule
Update submodules
Merge branch 'master' of https://github.com/loicloic/OpenEmu