This enforces the warning that settings will not be applied until
streaming is restarted from the settings dialog for all profile settings
Also fixes a bug that would prevent start streaming/recording buttons
from being properly enabled/disabled when switching from a
recording/streaming only profile to a streaming/recording only profile
on stream stop
Additionally, the microphone volume meter got disabled when switching
from a profile with microphone enabled to a profile with microphone
disabled while the microphone was still active
Make the Profiles dropdown have focus instead, so accidental keypresses
don't change the current language. Also make cancel cancel the language
setting and make user confirm changing it when switching settings pages.
