Hopefully this will make people stop thinking it's a hard dependency.

While not having a noticeable effect on CPU-bound applications, this
change gives an about 30-50% increase in performance for games using
the GPU.

Added CreateFile to the FS_USER service

Tested with hwtests.

armemu: Implement SADD8/SSUB8

Thread: Wait current thread on svc_SleepThread

Travis: Enable caching of dependencies

- Removed unused VBLANK sleep mode
- Added error log for bad context switch
- Renamed VerifyWait to CheckWaitType to be more clear

Kernel: Implement support for current thread pseudo-handle

dyncom: Implement UMAAL

armemu: Fix SSAT16.

armemu: Should be using labs for USAD8/USADA8

armemu: Implement USAD8 and USADA8

armemu: Implement SMLSD

armemu: Implement QASX and QSAX

Pica progress: Texturing, shaders, cleanups & more

More specifically, this also fixes crashes by Citra trying to load a src2 register even if the current instruction does not use that.

Makes for cleaner and faster code.

This allows for proper emulation of the different CMP/LRP/MAD instructions.