EZP-22999: refactor gateway for reusage and move logic up to the storage
EZP-22999: add Url gateway and storage tests
EZP-22999: XmlText and RichText: aggregate Url gateway
EZP-22999: removed deprecated TODO
EZP-22999: fixed file description
EZP-22999: added logging to UrlStorage
EZP-22999: removed duplicated tests
EZP-22999: fix instatiating RichText converter
EZP-22999: remove unused import
EZP-22999: RichText: test logging
EZP-22999: simplify mock a bit
EZP-22999: RichText: tested setConnection()
EZP-22999: implemented deleteFieldData()
EZP-22999: fixed: don't use FQN
EZP-22999: improved docblocks a bit
Merge pull request #892 from ezsystems/fix-EZP-22999-richtext-xmltext-deletefielddata

Fix EZP-22999: XmlText and RichText do not implement FieldStorage::deleteFieldData()