Improve return type hint
Import namespace and remove unnecessary FQN
Fixed: PHPDoc
Fixed: class description
EZP-21580: when creating URL link it with Field
EZP-21580: handle non-existent URL, add todo
EZP-21601: implement deleting URLs
Merge pull request #518 from ezsystems/fix-EZP-21580-store-ezurl-field

Fix EZP-21580: Creating content with URLs does not store url links correctly