I'm trying to keep ostree as being closer to just being the versioning
filesystem, so let's split out the triggers into a different binary
(although still namespaced ostree-).
Since we're making a shared library, it should be usable by non-GPL
apps.
To allow more code sharing between the core and the tests, move them
to the LGPLv2+ too.
A few bits of test and other code are still GPL. See the new COPYING
file for more information.