dyncom: Implement QADD/QSUB/QDADD/QDSUB

AddressArbiter: Ported arbitration type 2 from 3dmoo.

Loader: Add support for loading NCCH ROMs with the .3DS extension

Mutex: Add the calling thread to the waiting list when needed

Stub the y2r:u service

citra-qt: Added license headers to files.

skyeye: Remove duplicate typedefs

This will happen when the mutex is already owned by another thread. Should fix some issues with games being stuck due to waiting threads not being awoken.

citra already has its own typedefs like this.

Frontends: Shutdown core when emulation is stopped

FileSys: Fix crash bug in DiskFile exposed by #400

FileSys: Fix a few memory leaks

(Thanks 3dmoo!)

Core: Change default CPU to dyncom.

dyncom: Implement SMLAW

VFP: Minor cleanup, functionally the same.

dyncom: Implement REVSH

Also joins the REV ops into one common place.

dyncom: Implement SMLALD/SMLSLD

Implemented the SaveDataCheck archive

dyncom: Implement SMMLA/SMMUL/SMMLS

Fixed a few warnings and cleaned up the code

This allows Steel Diver to boot further, some files are needed.

This is still not ready and needs a big cleanup, this will possibly be delayed until the way we handle archives is fixed (with factory classes instead of ahead-of-time creation of archives)

archive/elf: Minor misc changes.