WOBS-2931: Removes unique constraint, is not needed for many to many relation
WOBS-2931: Implements paginator for entry overview, also fixes some PSR standards.
WOBS-2931: Fixes use statements according to PSR standards.
WOBS-2931: Adds prepare functionality for entries
WOBS-2931: Splits Admincontroller into seperate controllers for entities

Splits main controller into seperates ones and does all renaming for
templates and url generation.
Also fixes deleting entries when being published.
WOBS-2931: Fixed delete confirm dialogs and delete actions