add a pairing endpoint

+ append / to folder paths
+ filter recently played by logged in user id
+ fix typo in login response
+ update track logger migration to add foreign key

TODO.md

@@ -1,16 +1,16 @@
 # TODO
 - Migrations:
     1. Move userdata to new hashing algorithm
-- Store (and read) from the correct user account:
-    1. Playlists
-    2. Favorites
+
 - Package jsoni and publish on PyPi
 - Rewrite stores to use dictionaries instead of list pools
 - last updated date on tracks added via watchdog is broken
-- hide "remove from playlist" option on system playlists
 
 # DONE
 - Support auth headers
 - Add recently played playlist
 - Move user track logs to user zero
-- Move future logs to appropriate user id
+- Move future logs to appropriate user id
+- Store (and read) from the correct user account:
+    1. Playlists
+    2. Favorites