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
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
new coordinate calculations for head penumbra filter
Merge branch 'master' of https://github.com/highfidelity/hifi into 19964
code review comments
fix huge-mega-voxels and voxel file corruption
more guards to corrupt voxel files
dead code cleanup and comment cleanup
better handling of old model files
removed some debug code