2sxc 08.07 with quickE 2.0 and Date Picker improvements

Mainly

1. quickE 2.0 with move/delete module in dnn preview mode
2. various date-time picker fixes & improvements in the edit-dialog
3. some refactoring of internal components
4. various hotfixes

In total 27 issues https://github.com/2sic/2sxc/milestone/111?closed=1