Replaced ClearVertices and RemoveVertices with SetNumVertices.  Removed ReserveSpaceForMoreVertices as obsolete.
Fixed MakeWeightedAverage to set FTD and NTD.
Fixed Set/Get First/Num ToDraw to operate on the dest tween state and actually set their values correctly.
Moved AMV::AMVTS::SetFirst/NumToDraw to one-liners in header.
Merge pull request #8 from kyzentun/AMV_Kyzentun

Replaced ClearVertices and RemoveVertices with SetNumVertices.