This change replaces icecast.xml with icecast.xml.template. A
complete icecast.xml is no-longer provided.
Instead, to create icecast.xml run:
make
You can generate icecast.xml and then install it:
make install
This doesn't currently do any aspectss of making the system ready to
run icecast (e.g. performing `sudo apt install icecast2`, or similar).
