TODO:
* Create a Route Template Manager in libardour, to populate the lists
* Implement right-click operations to rename and remove items in list
* Add a button to create new snapshot, or Import a snapshot from other session
* Probably: turn the mixer-list into a set of tabs, like the editor list
Copyright-holder and year information is extracted from git log.
git history begins in 2005. So (C) from 1998..2005 is lost. Also some
(C) assignment of commits where the committer didn't use --author.
