Set same capabilities at the two ends.
We are using RGB16, so fix black&white values.
Extend GuiMixin.
Handle carefully calls to Gtk's threads.
Add 'activated' signal.
Make possible to use caps filter in our recursive elements linking.
Use caps filter to manage monitor capabilities.
Update README.
Add missing glade file.
Add StreamStudioMonitorOutput class.
Factorize code.
Rework streamstudio module.
Add StreamStudioMonitorOutput.
Fix missing attribute.
Fix missing import.
Fix docstring.