Merge pull request #794 from nlegoff/fix1562

Fix #1562 Migration Error
Add UrlGenerator trait
Merge pull request #804 from romainneutron/url-generator-trait

[3.9] Add UrlGenerator trait
Merge pull request #803 from nlegoff/update_namespace

[3.9] Remove obsolete namespaces in composer.json
Remove DoctrineFixtures mechanism
Update cpsr.lock
Fix tests