Check if our canvas has focus.  If not, then ignore events passed to it.
Use _mouseX and _mouseY for mouse look instead of the global mouse position when idle (prevents mouse look from accidentally triggering when the window is inactive).
Check if our main window is our application window within Application's event handling functions.
Don't render the voxel selection when we're moving over a maximum velocity.
Merge branch 'master' of https://github.com/worklist/hifi into 19361
Real max velocity stuff.
Get the average velocity of the avatar.
Add a distance check for selected voxels.
Remove seemingly unnecessary coordinate space conversion.
19369 - Added "Use Gravity" option
implement keyhole frustum
fix spacing
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
Merge pull request #514 from ZappoMan/keyhole_frustum

Keyhole frustum
Adding density to nodes
Merge branch 'master' of https://github.com/worklist/hifi
fixed CR spacing issue
Merge branch 'master' of https://github.com/worklist/hifi into keyhole_frustum