rename AGENT_TYPE_VOXEL and PACKET_HEADER_DOMAIN_RFD
more renaming for AGENT_TYPE_VOXEL_SERVER
remove ShareAudioFactors struct from audio-mixer
unthread DS check in, allow agents to tell DS who they want to hear about
use new non-threaded method to checkin with domain server
agentTypesOfInterest need not be unsigned and remove debugging
ask only for agents of type AGENT_TYPE_VOXEL_SERVER
if an agent doesn't send a list of types of interest assume it wants to hear about nobody
hook audio-mixer up to new domain server check in method
hook the avatar mixer up to the new domain server check in method
hook eve up to new domain server check in method
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
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.