Set meta + mute as a default shortcut to mute the microphone
Commit #1 (closed)
Support multiple default shortcuts. This wasn't exposed to moc, but everything was there. I'll make a corresponding Qt6 patch soon. The changed signal is what's also used for setShortcut, and I verified it's also the case for setShortcuts.
Commit #2
Not many keyboards have thew AudioMicMute, whereas AudioMute is quite prevalent.
This patch sets meta + normal mute as an alternate shortcut to mute microphone input.