New features

See the full release notes at: http://docs.aegirproject.org/release-notes/3.18/

See the full release notes at: http://docs.aegirproject.org/release-notes/3.18/

See the full release notes at: http://docs.aegirproject.org/release-notes/3.18/

- Removed session_cache module as dependency. It builts its own session cache service.
- Refactored the Global Filter service so developers can use any cache back-end they want.
- Removed deprecated code as for drupal 8.7

PETs are not translatable.
Fixed token parsing error with the latest core.