Database updates (#144)

* start moving some database stuff around

* continue moving db stuff around

* more fiddling

* more updates

* and some more

* and yet more

* i broke SOMETHING but what, it's a mystery

* tidy up

* vendor ttlcache

* use ttlcache

* fix up some tests

* rename some stuff

* little reminder

* some more updates

internal/cliactions/server/server.go

@@ -62,6 +62,8 @@ var models []interface{} = []interface{}{
 	&gtsmodel.MediaAttachment{},
 	&gtsmodel.Mention{},
 	&gtsmodel.Status{},
+	&gtsmodel.StatusToEmoji{},
+	&gtsmodel.StatusToTag{},
 	&gtsmodel.StatusFave{},
 	&gtsmodel.StatusBookmark{},
 	&gtsmodel.StatusMute{},