Change TMemCheck::Action to return whether to break rather than calling
PPCDebugInterface::BreakNow, as this simplified the implementation; then
remove said method, as that was its only caller.  One "interface" method
down, many to go...

Conflicts:
	Source/Core/Core/HW/Memmap.cpp
	Source/Core/Core/HW/Memmap.h
	Source/Core/DolphinWX/Debugger/CodeWindow.h

Another host function that can be killed off by simple wx event handling

This moves the Gekko disassembler to Common where it should be. Having it in the Bochs disassembly Externals is incorrect.

Unlike the PowerPC disassembler prior however, this one is updated to have an API that is more fitting for C++. e.g. Not needing to specify a string buffer and size. It does all of this under the hood.

This modifies all the DebuggingInterfaces as necessary to handle this.

Breakpoints have one, but memchecks don't, despite being cleared directly in the breakpoint window.

Now DolphinWX should call the interface functions and not the direct functions of the breakpoints or memchecks for clearing.

This is the standard coding convention in the codebase, so our interfaces should use it too.