new table type
Table JSON data
Add VR display auto-calibration logic
Add VR display auto-calibration user message calculations
Move table view code + wire row delete
Merge branch 'master' of https://github.com/highfidelity/hifi into attenuation_zones

Conflicts:
	domain-server/resources/describe-settings.json
Make overlays accessible from C++ code
Add some property setters to the billboard overlay
Display a static billboard prompting user to hold still to calibrate HMD
Fix avatar rotation erroneously initiating HMD calibration
Delete calibration message if exit VR display while calibrating
Merge branch 'master' of https://github.com/highfidelity/hifi into attenuation_zones
Merge branch 'master' of https://github.com/highfidelity/hifi into attenuation_zones
Fix header declaration
Working on metavoxel averaging.  Still pretty rough.
Get table data over to DS
Playing around with using points to represent distant voxel surfaces.
Merge branch 'master' of https://github.com/highfidelity/hifi into attenuation_zones
More fiddling with averages.
remove font settings for chat entry