VR Expansion Plugin

Thanks for the contribution! I had plans to get around to something like that eventually but hadn’t done so yet.
I’ll merge it in and make a few minor changes.

Edit
You will notice that I adjusted the FeetLocation code to be more simplistic.

We don’t actually need the GetActorFeetPosition() function because the VRCharacters base location
is actor 0 on Z and the Simple Characters base position is +HalfCapsuleHeight which is accounted
for with the VRSceneComponent which adjusts downward by -HalfCapsuleHeight.

So all that is really needed is to set the relative Z location to 0.0f if wanting to use foot position, which is both faster, and cleaner.

However thanks for the core concept, I am sure that plenty of users will appreciate the addition.