Version 2.3b - GC/Perf fixes. Seated Universe fix. Misc api updates

Changes for 2.3b 
 
 * Fix for runtime action instantiation generating garbage 
 
 * Fix for setting Universe Origin at runtime. SteamVR.settings.trackingOrigin will automatically set all pose origins and the compositor origin (hmd) 
 
 * Physics objects correctly teleport while held now 
 
 * Fix for left hand being inside out sometimes. 
 
 * Fixed some perf and gc issues in the skeleton 
 
 * Updated poses to support 120hz prediction better 
 
 * Fix for IL2CPP compilation 
 
 * Fix for poor interpolation when dropping objects with left hand 
 
 * Added SteamVR_TrackingReferenceManager to allow showing tracking devices (base stations / cameras) 
 
 * Typo fix for GetStateUp returning GetStateDown 
 
 * Added ability to suppress updating the full skeletal bone data and only update summary data SteamVR_Action_Skeleton.onlyUpdateSummaryData 
 
 * Added access to different skeletal summary data. SteamVR_Action_Skeleton.summaryDataType specifies if you want the summary of the animation data or the summary of the device data. Device data may be faster but different than animation data. 
 
 * Added wrappers for ShowActionOrigin and ShowBindingsForActionSet. See SteamVR_Action.ShowOrigins() .HideOrigins(). SteamVR_ActionSet.ShowBindingHints() .HideBindingHints()

Author: keithbradner

Assets/SteamVR/Extras/SteamVR_LaserPointer.unity

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