Started adding support for filter_audio
Update README.md

Moved a section
Audio filter implementation should be done now
Update README.md
Simplify friendId/message check

The original check uses double negation and is overly complicated.
The modified check, while easier to understand, fulfills the exact same
function.
Add tooltips to the checkbox settings

A short sentence about what a specific setting does would help new
users to better understand them.
Merge pull request #23 from UrbanCMC/master

checkbox tooltips and minor refactoring
ToxAv updates
Merge remote-tracking branch 'origin/master' into proper-group-peer-list