Mumble local overlay

[MrTomRobs]

Once again, unsure of whether to put this in as a suggestion or feedback, but seeing as it's OB, i'll leave it as feedback.

When people are talking on the local channel, it shows up on the overlay regardless of your relative position to them. Having never used the overlay before in regular mumble, having it integrated is a new experience for me. Personally, i think it would be more prudent to have the overlay activate when the people who are speaking are within audible range.

On the whole though, i've been very impressed with the integrated mumble. I'll need to adjust my settings a little bit more because i use my headphones, but the audio quality is tops and the usability is as good as always carrying on from 1.0