Merged a current version of QPersistence and made the code compile.
Also: Merge branch 'meineAltenAenderungen' into Test.

Conflicts:
	Server/src/controller/controller.cpp
	Server/src/ui/mainwindow/model/downloadsitemmodel.cpp
Moved castList from Qp::Private to Qp
Added possibility for bulk execution of queries for increased performance.
Increased performance of object creation by not resolving relations before objects have even been exposed to the user.
Improved performance of the meta object system by caching more attributes of metaobject and metaproperty.
Improved performance of QpDao::readAll and ::count by using the cache more efficiently.
Combined QpAbstractObjectListModel and QpObjectListModel.
Created QpSortFilterProxyObjectModel.
Fixed warning
Merge commit '982b024d2c70cbae4ddb8309edbbbeb6860e039c'
Fixed broken things after QPersistence merge.