vfp: Remove dead code

Pica/VertexShader: Implement the MAD instruction.

Pica/VertexShader: Implement JMPC/JMPU/CALLC/CALLU.

dyncom: Fix 32-bit ASR shifts for immediates

dyncom: Remove unused flag macros

Qt Callstack: Clear the callstack every time it's updated

dyncom: Fix some more V-flag setting ops. Plus some cleanup.

Also cleans up CMN, and CMP.

This fixes the issue that old members of the callstack would stick around, even when the callstack shortened.

Fix MinGW build, again

dyncom: Fix ADC overflow flag setting

SVC: Wake up the thread after the delay in WaitSync1

dyncom: Fix conditional execution of MSR

Replace OnCpuStepped signal

Add appveyor.yml for AppVeyor support

Thread: Prevent waking a thread multiple times.

If a thread was woken up by something, cancel the wakeup timeout.

citra-qt: Fixed some Qt errors on initialization

Stubbed y2r:u IsBusyConversion

There is no documentation available on this function, but we set the result to false as a stub.
This allows Super Little Acorns to move all the way in game with pp3c.

Small additions and fixes to logging

Revert "Travis: Enable caching of dependencies"