Configuration files

Uses QSettings on citra-qt, and inih on citra-cli.

Fix the filesystem implementation in order to get blargSnes to run

Core: Fix the SDMC Directory implementation to make blargSnes work.

FileSys: split the constructor into an Open method, in order to notify the opener something went wrong.
Kernel: Return an invalid handle to OpenFile when it failed to open.

Added some more names to the function table

Added "SetApplicationCpuTimeLimit" and "GetApplicationCpuTimeLimit" to apt.cpp

Added "StoreDataCache" to the function table

seems simple enough

Fix warnings in core and common

chunk_file: General cleanup

Use the citra user path for the sdmc directory

- Remove unnecessary ifdefs
- Remove commented out code. Can be retrieved later if needed.

Implement filesystem services, and the required kernel objects.

Core: Replace a sprintf in core_timing with StringFromFormat

Core: Get rid of unnecessary switch statement in Kernel

Core: Fix warnings in gpu.cpp

Small, general code cleanup 

Digital user input and HID module implementation for PAD