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.
Merge branch 'master' of https://github.com/worklist/hifi into 19361
Merge pull request #511 from Geenz/19361

#19361  Don't select voxels when in motion or displaying other window on top, and don't show if too