Common: thread.h cleanups

The helper classes are rendered obsolete by C++11 lambdas. Also made
formatting conform to our code style.

De-inline functions from Interface, removing them from service.h

Fix a few warnings as reported by clang 3.6

This reduces the time for a full recompile from 65.43s to 59.53s (~9%)

Thread priority and scheduler improvements

- CreateMutex/ReleaseMutex/ReleaseSemaphore/SetTimer/CancelTimer/ArbitrateAddress

SVC: Return correct error code on invalid CreateThread processor ID.

SVC: Assert when creating a thread with an invalid userland priority.

Shared_memory: Initialize base address to 0x0

gpu: Fix a missing format specifier

dyncom: Remove unnecessary enum and typedef

IR: Move The IR services to their own folder and implement "GetHandles"

Also fixes descriptions in the process.

vfp: Minor cleanups

dyncom: Set the MPCore CP15 register reset values on initialization.

dyncom: Suppress uninitialized variable warnings

Also gets rid of preprocessor mumbo-jumbo

The switch cases will always be hit, but this makes compilers stop complaining.

Clean-up mem_map constants and fix framebuffer translation errors

Changed occurences of colour to color for consistency

Allow the user to set the background clear color during emulation