remove the hardcoded floor and table static-bodies and instead, put a static-body on tyhe environment-root that gets shape components inflated under it.

add nav-mesh-helper component to force calling queryCollisionEntities() once an environment has changed

username labe

remove the watch since we have the hud now. Will need to fix the bug (https://github.com/mozilla/mr-social-client/issues/171) if we add it/something similar back in.

visibility code

no more cursor lock; super-cursor follows around cursor screen position; look-controls are paused when an interactable is grabbed; colors changed; cursor no longer appears to be in "hovered" state when moused over the floor or table;