MFI Controller Fixes

- Added missing shoulder buttons to "Standard" controller type
- Fixed unresponsive left thumbstick on "Extended" controller type (caused by "Standard" controller type sending direction released commands at the same time)
- Pause button brings up SiOS menu
- Select/Start can be triggered by extra Left/Right Trigger buttons on "Extended" controller type (allowing games like Super Metroid to be manageable in combat)
- Select/Start can be triggered by holding Left Shoulder + Pause / Right Shoulder + Pause on "Stanard" controller type (allowing games like Super Metroid to be manageable in combat)
MFI Pause button now defaults to START instead of SiOS Menu
File browser and association fixes
Merge https://github.com/RobMSantos/SiOS into robm
- Updating changelog;
- Fixing a missing “break;” (I hate switches).