Remove custom behavior from chat window
Remove custom styling
Merge branch 'master' of https://github.com/highfidelity/hifi into 19964

Conflicts:
	interface/ui/preferencesDialog.ui
Fix preferences dialog layout
new audio format object
Merge branch 'master' of https://github.com/highfidelity/hifi into 19964
Layout fixes
restore default buttons events
Merge branch 'master' of github.com:highfidelity/hifi into 19968
Add margin to chat window for titlebar + menu
Update chat to close on ESC
Merge branch 'master' of https://github.com/highfidelity/hifi into 19964
layout tweaks
Merge branch 'master' of https://github.com/highfidelity/hifi into 19964
audio menu changes to support tone and noise generators
Merge branch 'master' of https://github.com/highfidelity/hifi into audio-noise
improve ping behavior and clockskew in octree servers by introducing datagramprocessing thread
fix header
new tone generator audio source object
new pink noise generator audio source object