[-TASK] Extbase (Persistence): Removed unnecessary classes, code and empty interfaces.

[-TASK] Extbase (Persistence): Removed unnecessary classes, code and empty interfaces.
[!!!][~API] Extbase (Persistence): Marked Query::withUid() as deprecated. Will be removed with Extbase 3.0.
[+TASK] Extbase (MVC): Fixed missing exception class. Resolves #6732.
[+FEATURE] Extbase (Persistence): Implemented Query::implodeAnd(array) and Query::implodeOr(array). Please give Feedback on this Feature. This is not yet part of the API! Related to #6735.
[+FEATURE] Extbase (Persistence): Query::logicalAnd() and Query::logicalOr() allow 2 or more Constraints as argument, now. This is not yet part of the API! Please give Feedback on this Feature. Related to #6735.
[~TASK] Extbase (Pesistence): Some more code cleaqn-up and improved PHP doc.