Remove fr:date-picker from Controls Forms

We have decided to deprecate this control.
Implement #1555 "FB: UI to edit control, grid and section classes"

- add field for custom classes to 3 dialogs
- also add standard option for page break before sections
- some renaming for consistency
Implement #1556 "PDF: Option to output a page break before a section"

NOTE: Option itself committed with #1555.