Fix udp sync and add mute button

[wiiznokes]

The udp method is now able to detect a succefull connection on Android with this change to the .proto file:

message ConnectMessage {}

message MessageWrapper {
  oneof payload {
    AudioPacketMessageOrdered audio_packet = 1;
    ConnectMessage connect = 2;
  }
}

when the rust app receive the ConnectMessage variant, it know it has to send a success message back to Android. This seems to work really well when i tested it.

I also moved the port selection to settings window because it looked bad.

And i added a mute switch, only visible when connected (fix #133)

[teamclouday]

Awesome thanks for the PR! I didn't know this oneof was possible haha.