OpenVR SDK Update 0.9.13:

* IVRSystem 
  * Added new APIs GetTrackedDeviceIndexForControllerRole() and GetControllerRoleForTrackedDeviceIndex() to get the correct devices for the left and right hand controllers.

* IVRChaperone
  * API GetBoundsColor has changed to also return pOutputCameraColor.

* IVROverlay
  * Added GetTransformForOverlayCoordinates() to return the 3d space transform for a given 2d point in an overlay.
  * Added SetKeyboardTransformAbsolute() to set the keyboard position in 3d space
  * Added SetKeyboardPositionForOverlay() to set the keyboard position appropriate for an overlay

* IVRControlPanel removed
* Misc new types added

[git-p4: depot-paths = "//vr/steamvr/sdk_release/": change = 3201700]