Added changelog for #463, #160, #147, #346

changes/changelog.d/346.bugfix

+- Fixed splitted album when importing from federation (#346)

changes/changelog.d/463.feature

+- Per user libraries (#463, also fixes #160 and #147)
+
+Per user libraries
+^^^^^^^^^^^^^^^^^^
+
+This release contains a big change in music management. This has a lot of impact
+on how Funkwhale behaves, and you should have a look at
+https://docs.funkwhale.audio/upgrading/0.17.html for information
+about what changed and how to migrate.