Allow to hide CCLI number per song in footer
Original Launchpad bug 1694428: https://bugs.launchpad.net/openlp/+bug/1694428
Reported by: sam92 (Samuel Mehrbrodt).
When entering a CCLI number in the settings, it is shown in every song in the footer.
Some songs might be covered by another license, so it makes no sense to show the CCLI license # in that case.
There should be a way to define for each song whether it is necessary to show this or not.