make pulsate function into a cos
return value by reference
Set a minimum mute intervalle in the mixer
Extra space
Moved spanners into separate file, working on heightfields as spanners.
add a guard in case local audio cannot be handled
Merge pull request #3768 from Atlante45/mute_when_noisy

Mute when noisy / Pulsing mute button
Merge branch 'master' of https://github.com/worklist/hifi
Merge remote-tracking branch 'hifi/master'
Merge pull request #3769 from birarda/plugs

add guard for handling of local audio
Merge pull request #3758 from ey6es/master

Mirror/warning fixes.
More work on heightfield spanners.
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
More heightfield bits.
Formatting changes
Minor formatting change
Merge remote-tracking branch 'hifi/master'
Merge pull request #3760 from DaveDubUK/20142

CR for Job #20142 - Walk Cycle Polish Description
Merge remote-tracking branch 'hifi/master'
Add Grid3DOverlay