WL job #19484

- Move 'Fly to voxel on click' menu item;
- add shortcut for muting audio ...
Rename mute menu
add script number to menu items so that we can run multiple copies of same script
added scriptEnding callback
added count example
Merge branch 'master' of https://github.com/worklist/hifi into 19484
fixes for avatar paddle-hands, plus some hackery for demo
Merge branch 'master' of ssh://github.com/highfidelity/hifi into paddle-fixes
adding back log about mismatching packet type
Fixed mouseVoxel getting resized all the time when flying over smaller voxel
Merge branch 'master' of https://github.com/worklist/hifi into 19484
Merge pull request #1576 from Atlante45/master

Fixed mouseVoxel getting resized all the time when flying over smaller voxels
Merge pull request #1573 from stojce/19484

Code Review for Job #19484
switch back to returning iterator from killNodeAtHashIterator
switch to explicit lock and unlock in removeSilentNodes
use new signal slot syntax in JurisdictionListener
comment out the JurisdictionListener's connection for now
add mutex locking to NodeHash
remove two unused variable warnings
repair badly scoped usage of QMutexLocker