Prevent audio encoding CPU exhaustion

No need to encode too much audio if we're not going to take th time to send it. opus_encode is really slow
Try to fix audio on windows
Merge pull request #48 from F1ynn/master

Add option to copy friend's ID to the system clipboard
Cancel sleeping in audio recording
Restore sleep in audio recording
Enable IPv6, needed for LAN discovery
Add option to disable IPv6

Fixes #50
Merge branch 'upstream/master'
Use darker gray for own messages

Fixes #51

I hope you're happy, platos
Merge branch 'upstream/master'
improved yuv->rgb convertation speed
Merge pull request #54 from retuxx/video

YUV->RGB improvement
Check mapping errors in getLastVPXImage
Merge pull request #1 from tux3/master

Rebasing on upstream