Plugins Embody

Thanks @HAL9001 for the PRs!

- Fix error in hair handler when no material references were found
- Fix error on startup when possessor is not found

- Position smoothing deadzone (Thanks @HAL9001!)
- Support NorthernShikima.SkinMicroDetail (Thanks @HAL9001!)

- Revert to main screen when loading a profile
- Fix Vive Trackers section UI drifting down
- Trackers sliders default val should be 0
- Fix joystick controlling the head rotation in VaM (contribution by @itsgus)

- Triggers on activate / deactivate
- Passenger: Buffer position for reduced lag
- New preset to hide head only, passenger with free movement
- Don't log an error when activating while Embody or the atom is deactivated, silently set back active to off
- Ensure Passenger lock returns to default when using presets
- "Keep physics hold strength" shouldn't be reset when using "align all vive trackers"
- Fix crash when "apply on load" is active on a non-person atom
- Passenger should be on by default on non-person atoms
- Disable Embody when toggling modules on or off

- Hide eyebrows and eyelashes when "hide hair" is off during possession
- Option to keep the tongue during possession
- Improved person height measurements (slightly more reliable)
- Clearer error messages in cases where the model has no bones
- Hide currently possessed controls
- Triggers for hands enabled (asked by @XRWizard)
- Set "Keep physics hold strength" on all controls at once in Trackers Settings
- Fix: Default modules not selected without a default profile (nothing would be selected by default)
- Fix: Incorrect height after first possess
- Fix: Crash breaking VaM completely on a new scene load (for broken profiles)
- Fix: Silent error that would spam in log files (IsSpawnPointHost)
- Fix: Re-applying a preset using triggers will not work when invoked twice
- Fix: Remove incorrect asterisk next to "Toggle Key" option
- Fix: Crash when saving a default profile with a custom eye to head offset or passenger with allow head rotation

- Passenger: GREATLY improve stability during camera rotation (thanks @vamurai for your help!)
- Passenger: Allow disabling Exit On Menu Open so @hazmhox can trap you in his worlds
- Passenger: Allow for pitch (rotate vertically) in VR
- Hide Geometry: Fix for Male 9 (Scott) showing an error and not hiding the brows

- Reset simulation after applying a possession pose to reduce physics crashes
- Fix crash when applying possession pose
- Thanks @lapiroman for raising the issue and testing the fix!

- Add "use profile" to the Passenger options, to allow disable "exit when menu open" at the scene level
- Fix for Timeline v5.0.0-beta.2 to allow recording with Embody without having the first frame overwritten when leaving Embody
- When applying the possession pose, invoke the position changed events so plugins can react to it (e.g. Timeline will create a keyframe)
- Correctly restore canGrabPosition, canGrabRotation and hold position/rotation spring when restore pose is off in Trackers
- Fix crash when the saved profile uses Passenger's look at weight and Embody is loaded on a non-person atom

- Clearer error when adding Embody as a session or scene plugin
- Fix skewed hud showing when in VR Monitor mode
- Allow activating Embody in Wizard even if the toggle is disabled
- Fix restore defaults not restoring the mapped controllers in Trackers

- ReinitializeIfActive storable trigger to re-apply Embody correctly after loading a pose
- Allow a None world scale option to disable world scale in the preferences even though it's active in the scene
- Add a "fixed" world scale value option to allow scene creators to control the exact scale
- Allow world scale on non-person atoms
- Remove the hologrid when using world scale
- Fix SpawnPoint atom lists not updated when adding SpawnPoint after Embody