Add SetFocusPointForFrame stability plane to GazeManager
Add SetFocusPointForFrame stability plane to GazeManager

By adding the SetFocusPointForFrame to the GazeManager, we will help
stabilize the hologram the user is currently gazing at.

Polyrhythm/bud,davesmits/HoloToolkit-Unity,ContextVR/HoloToolkit-Unity,NeerajW/HoloToolkit-Unity,ForrestTrepte/HoloToolkit-Unity,CombatCube/HoloAtelier,CameronVetter/HoloToolkit-Unity,HoloFan/HoloToolkit-Unity,paseb/HoloToolkit-Unity,darax/HoloToolkit-Unity,out-of-pixel/HoloToolkit-Unity,micthom-msft/HoloToolkit-Unity,HattMarris1/HoloToolkit-Unity,willcong/HoloToolkit-Unity,joevdh/HoloToolkit-Unity,vbandi/HoloToolkit-Unity,dbastienMS/HoloToolkit-Unity,chadbramwell/HoloToolkit-Unity,paseb/MixedRealityToolkit-Unity,thewesleycrushers/hololens