Added a "VR" GUI Button and also added it to the toolbar.  Freelook, HUD, scale, tilt and other adjustment options are now reconfigurable and can be defined from here.  All the GUI code is done, but some of the actual backend code still needs to be done, so it's not complete.  Very rough start.
Added the rest of the backend code.  Untested, but should be working.  Fixed a couple small bugs/typos.
Merge branch 'VR-Hydra' of https://github.com/cegli/dolphin into VR-Hydra

Conflicts:
	Source/Core/DolphinWX/DolphinWX.vcxproj
	Source/Core/DolphinWX/Frame.cpp