19369 - Added "Use Gravity" option
adds menu option to set whether ground plane gets rendered
removes blank lines that slipped in
Merge branch 'master' of git://github.com/worklist/hifi into 19367
Adding density to nodes
Merge branch 'master' of https://github.com/worklist/hifi
Finished adding concept of density to the voxel server, objects now appear more visible at a distance in an appealing way.
Merge branch 'master' of https://github.com/worklist/hifi
Added shortcup for gravity use
Fixed merge conflict
Correct after blending.
Merge pull request #518 from Atlante45/19369

Code Review for Job #19369
Merge pull request #519 from Geenz/master

Tweak atmospheric shaders assuming the values are intended to be linear to give them a seemingly "softer" appearance.
Merge pull request #517 from PhilipRosedale/master

Added voxel system physical 'density' for better/correct appearance of objects at distance
Merge pull request #520 from tschw/19367

Code Review for Job #19367
more work on avatar touch
Merge remote-tracking branch 'upstream/master'