This reverts commit 90c03c86.

User is aksed for a login+password couple if none of these have been filled in preferences.
He can allow Sankoré to store it in checking "Remember credentials".

Аudio widget is not update button view.

Angles are now copied when saving tool state.

UBToolWidget is QWidget now.

Still have some mesh with undo stack and with widget content.

Reworked resizing of items on board. Still have troubles with resizing at BottomRight resizer.

Now 1st added pixmap is selected.
All selected items is deselected after adding any new item.

Document navigator: "Add pages from file" isn't work with old UBZ