Fix #627 Clear text fields when removing a talk or removing all talks
Added ComboBox for Quality selection
Ogg Output settings now modified by quality selection
Add Audio/Video quality saving to config. All output plugins except WebM now affected.
Added bitrate/quality customization to Ogg Icecast.
Some code changes
Added 'configurable' variable to output plugins class
Added scaling support
Moved video resolution determination to input plugins and passthrough plugin
Quality disabled for non-desktop sources
Removed redundant config loads
Removed config load checks for plugins that don't need it
Fixed config test and loading of avWidget
Modification to test
Some more efficiency improvements