[Feature] Hide RetroPie 'games'

[iskoSRC]

Currently, using gameOS on RetroPie has the seemingly unintended effect of putting the RetroPie settings panels (Audio, Bluetooth, etc.) as games. RetroPie also shows up as a 'system' for these 'games'. It would be great if gameOS could handle this batch of 'games' separately, as a standalone menu or by just filtering them out.

[HVR88]

I think this might be better handled directly in Pegasus itself, rather than trying to do it at the theme level, since it currently affects all themes.