v3: add easier way to refresh view data

[unitycoder]

if you adjust v3 settings on the fly, it doesnt automatically refresh view distances or other lod data..
(unless you turn around or move camera far away and back, to cause new check for tiles)

so should make it easier to force refresh or have option to auto-refresh (if value is changed)
https://forum.unity.com/threads/released-point-cloud-viewer-tools.240536/page-18#post-9798315