Add two actions to control sermon audio upload from the frontend

audioUploadWelcome: This is supposed to display a list of all sermons
without audio and allow to select one and attach an audio file to it.

audioUploadDone: This is supposed to add the audio file to the selected
sermon record and also tag (id3) the audio file with information from
the sermon record.
Merge branch 'master' of ssh://git@github.com/VolksmissionFreudenstadt/vmfds_sermons.git