rework audio-mixer to use orientations sent by clients
rewrite the AudioInjector to send an orientation quaternion instead of bearing
Adjusted default bind radius, spring vector threshold.
Add a reasonable minimum size for the URL field.
fix orientation setter in AudioInjector header
project source position onto XZ plane of listener
set injector orientation from bearing passed as command line argument
Merge pull request #484 from ey6es/voxeltars

Voxeltars!  Much tweaking still to be done, and they currently only show on the local avatar.
Merge branch 'master' of https://github.com/worklist/hifi into avatardata_optimization
Merge 19358 with upstream Master
correct spatialization and off-axis attenuation for a spherical source
move mixer related constants above related part of mix
merge conflict fix
correct direction of angle of delivery
We can't initialize avatars from the network thread; they need access to the
OpenGL context.
Merge pull request #486 from ey6es/voxeltars

Fix for glGenBuffers issue.
Fixed merge issue with new orientation vectors, migrated to common identity names
cleanup NULL comparisons in AgentList
fixed build issue
Merge pull request #478 from Atlante45/master

Settings handling with QSettings