- some missing url parameters from WallabagRestController & EntryController
- use a service for `EntryFilterType` to use fully qualified name instead (so changing class signature)
- update ImportBundle (url & form)
- list services in /import
- add url to import service
- ImportBundle routing are now prefixed by /import
- optimize flush in each import (flushing each 20 contents)
- improve design of each import
- add more tests