Arrow keys to move sources around for fine precision.
Merge pull request #59 from hwdro/master

Replace existing 5.1 downmix code
Update Dutch translation to incorporate recently added strings
listview fix so that columns autosize correctly
Merge pull request #60 from hwdro/master

Replace existing 2.1/4.0/4.1/7.1 downmix code | Some fixes in TextOutputSource