Feature release 2.3.0

New features:
- add translations to XLIFF
- add schema management
- add feature to chose own widget template
- add set unique as default at create
- add register at filter pass
- add check for unsupportet combinations of variant woth is-unique

Fixes:
- any fixes for PCHCQ

Hotfix release 2.2.1

- Merge translations

Stable release 2.2.0

This brings full Contao 4.9 support.

Additionally there have been performance improvements
and various bugfixes.

- Slug generator for special characters
- Option to prevent "id-" prefix for numbers

Bugfix release

- This adds the missing checkbox to allow searching over
  all languages.
- PHPUnit tests have also been adapted to new phpunit
  version.

This is a maintenance release.

Refer to #18

This is a maintenance release.

This release has:
- Add the support for 2.0

Maintenance release

Code and build cosmetics

Maintenance release.

This release allows to select system columns for alias generating.