Move AudioSourceInfo to its own class
Use ComboBox instead of ListView
Refactor PreferencesViewModel

Remove unneccesary event
Add testmic button
Merge branch 'master' of github.com:IMDC/LiveDescribe-Desktop into valdev

Conflicts:
	LiveDescribe/LiveDescribe/LiveDescribe.csproj
Merge branch 'master' into valdev
Implement mic check
Separate colour scheme settings into own control
Separate audio source settings from settings vm
Turn off mic test on all types of window close

"Turn down for what?"
"Turn down for close."
Add warning to mic test
Merge branch 'master' of github.com:IMDC/LiveDescribe-Desktop into valdev