This removes some deprecated methods and calls to them.
Namely Tx_Extbase_Persistence_Query::withUid()
and Tx_Extbase_Utility_TypeHandling::*().
Besides this fixes a doc comment and removes the obsolete
TypeHandlingTest.

Change-Id: I1d08783053c348e34efbc602af57b72f37afe6b8
Resolves: #13745