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"

Logging: Log all called service functions (under trace). Compile out all trace logs under release for performance.

CMake: Consistently set _DEBUG and NDEBUG in all platforms

Kernel Lifetime Reform Pt. 3

Build improvements

Cleanup: Remove redundant /Oi flag

Kernel Lifetime Reform Pt. 2

Warn if a new thread is intended to be run on the system CPU core

`/Oi` is included in `/Ox` already

CMake: Enable VS parallel builds for a good reduction in compile times

Passing -pthread to GCC as a flag makes it both link to libpthread, and make C standard library routines reentrant. This makes the additional explicit links unnecessary.

Additionally, on OSX, this is the default behavior, and clang will print a message about it being unused if it's present there.

These are implicitly linked by Xcode, but with this, you can also build it with any other generator, which does not have this behavior.

CoreFoundation is included as a part of Cocoa (which is an umbrella framework), and Cocoa is generally recommended to link against, rather than its individual components (CoreFoundation, Foundation, libobjc, ...).

This both reduces redundancy in add_executable definitions, and makes it easier to link additional libraries. In particular, extra libraries are needed on OSX - see next commit.

This enables the /MP compiler flag, which parallelizes builds of by
distributing compilation of individual object files across workes
processes, instead of being limited to per-project parallelism.

Reduces the time for a full compile from 72 s to 45 s on my machine.

Implemented timers

Core: Fixed a crash and removed some unused variables.

ARM_Disasm only has static methods, so there's no need to have an instance of it.

Timing: Use CoreTiming::GetTicks to keep track of ticks.