Plugins + Scripts Dynamic environment lighting

- fix trying to set wrong parameter name (shadowBias -> pointBias) that was putting entries into VaM output_log.txt). This wasn't causing any issue but it's worth cleaning up. Thanks to grendel69 for finding it
- added ability to freeze the rig in place, useful for small rooms where you don't want the light rig to follow or update
- updated so rig will do a full recalculation on scene load

- new 3-light mode that may improve performance or give a preferred look
- Improved color sampling
- VR performance improvement, sampling camera no longer runs through the VR stereo pipeline

Future plans:
- lock rig in place and don't recalculate: this will be useful for maybe like small rooms where you move the character but don't really want the light recalculating
- follow target: this is useful for mocaps where the person control stays in place, but the body moves around, allow the light to follow but do not update

- Changed some calculations for the ambient light.
- Fixed several bugs, one of which wasn't detecting new person atoms added to the scene
- you can now uncheck and recheck the plug-in to recalibrate instead of reloading (still calculates automatically though on person atom moving)

You will have to re-add this to your scenes as the path inside the VAR changed.