Add debugging assist code.

Define debuglayer in x64 debug so that it enabled dx11 debug layer.
Add D3D11_CREATE_DEVICE_PREVENT_INTERNAL_THREADING_OPTIMIZATIONS flag to prevent multithreading in the full debug case.
Add debug stop at dx11 load, to break from .ini if waitfordebugger=2. Doesn't work on Mordor though.

Improve log output for debug log.
Update convenience copy for debugging.