Add include to vrcontenttransform.cpp to compile in MSVC2010
Fail to track Oculus Rift input pitch/yaw.
Merge branch 'oculus-rift' of https://github.com/skyjake/Doomsday-Engine into oculus-rift

Conflicts:
	doomsday/client/src/ui/dd_input.cpp
Implement Oculus Rift primary pitch head tracking control.
Use accessor function instead of global variable for VR::mode
Create CVAR rend-vr-rift-aspect
Use Oculus Rift aspect retio in projection matrix in Rift mode, regardless of apparent screen resolution.
Create a CVAR for Oculus Rift horizontal field of view angle.
Adjust Rift mode to have a readable font size in taskbar
Update camera field of view in Rift mode, for correct culling
TODO - set it back when leaving Rift mode
Correct view fovy calculation in projection matrix.
Include pitch in late-scheduled update.
Add basic yaw head tracking
Stereo 3D|Client:Apply Rift latency prediction
Avoid changing (late scheduled) view direction between left and right eye views.
Late schedule Yaw, but only if it seems that only head tracker is moving Yaw.
Head Tracking|Client|Renderer: Improve Yaw late scheduling by comparing to uninterpolated target angle, and by minding circularity of angle differences.
Double size of Oculus Rift offscreen texture in each direction, so resolution is better at center, after warp.
Include "de_platform.h" per DaniJ suggestion.
Cleanup
Refactor|UI: Renamed LegacyWidget to GameWidget

This widget's job is to draw the 3D game world. All overlaid UI
elements will be split to another widget.
Refactor|UI|Client: Split GameUIWidget from GameWidget

The new widget handles the drawing of all overlaid UI elements
visible on top of the game's 3D world.
Stereo 3D|Oculus Rift|Client|Renderer: Modify TODO comment
Merge branch 'oculus-rift' of https://github.com/skyjake/Doomsday-Engine into oculus-rift
Fixed|libdeng2: Partially notifying a widget tree

When notifying a widget tree and stopping halfway, one has to make
sure the appropriate pre/post notifications still occur.

The requirement is that if pre-notification occurs, post-notification
will always occur, too.