com.unity.xr.hands 1.2.0 Package Notes

Added `IXRHandProcessor` interface that intercepts and allows post-processing joint data before being used by other scripts. More information can be found on the [XR Hands Joint Processing](../manual/process-joints.md) manual page.
Added two samples to the Hand Visualizer sample for how to use the new Joint Processing feature to change the visual output of hand tracking.
`XRHand` and `XRHandJoint` both now implement `IEquatable`, and have `Equals`, `GetHashCode`, and the `==` and `!=` operators overloaded.
Added `XRHandTrackingEvents` component that subscribes to hand tracking events for a specific hand and surfaces Unity Events when the hand updates or tracking state changes.
Added `XRHandMeshController` component that subscribes to events from a `XRHandTrackingEvents` and can optionally show or hide a mesh.
Added `XRHandSkeletonDriver` component that subscribes to events from a `XRHandTrackingEvents` and updates a hierarchy of Transforms for each `XRHandJoint`.

Fixed Hand Visualizer component so it will use another running `XRHandSubsystem` if the first is stopped.
Fixed exception in Hand Visualizer component when a joint is invalid.
Fixed rendering of lines that connect joints in `HandVisualizer` sample when used with the device simulator. Also removed the Origin property from the component since it was no longer used.

com.unity.xr.hands 1.2.0