[osx] Support planar audio devices in the core audio sink.
[cosmetics] indenting
[airtunes] - remove the old advanced_settings flag "enableairtunesdebuglog"
and replace it with the new optional component logging setting
Merge pull request #4422 from Memphiz/airtuneslog

[airtunes] - move the old advanced_settings flag "enableairtunesdebuglog" to the xbmc.debug addon
Merge pull request #4712 from jmarshallnz/ca_planar

[osx] support planar audio devices in core audio OSX sink