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

Services: Stubs and minor changes

The background color can be seen at the sides of the bottom screen or when the window is wider than normal.

dyncom: Isolate CP15 register reading and writing

Also implements writing to the rest of the ARM11 MPCore CP15 register set.

Keeps everything contained. Added all supported readable registers in an ARM11 MPCore.

callstack: Remove unnecessary disassembler instantiation

disassembler: Get rid of a const_cast