Actually make PPCDebugInterface::ClearAllBreakpoints have functionality.

Fairly simple - just clear the breakpoints.
Add ClearAllMemChecks to DebugInterface

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.
Mark functions in the PPCDebugInterface and DSPDebugInterface as final.

The way they currently were, they would allow for a class to inherit and override these interfaces functions. However, this doesn't make sense conceptually.
windows: move arch defines to base.props
Implement workaround for Windows versions which do not support XSAVE.

Fixes CRT math routines using FMA instructions from causing illegal instructions.
Merge pull request #140 from shuffle2/master

Implement workaround for Windows versions which do not support XSAVE.
Fix MAC address reading on Windows.
Merge pull request #141 from Parlane/fix_mac_read_windows

Fix MAC address reading on Windows.
Merge pull request #130 from lioncash/breakpoint-clear

Actually make PPCDebugInterface::ClearAllBreakpoints have functionality.