Feature/state variables

# Conflicts:
#	projects/common/components/button/button.component.ts
#	projects/editor/src/app/services/unit.service.ts

- Remove dynamicPositioning from PositionProperties. This is not 
knowledge that the element needs to know. In the few places it was used, 
it was fixed or solved by asking the containing section about which 
positioning is active.

- Fix and improve cloze child sizing. All can now have dynamic width and 
height.

- Fix empty lines in ClozeDocument rendering

- Editor SelectionService now knows if a cloze child is selected. This 
way the PropertiesPanel can show valid dimension inputs regardless of 
the underlying section.

- Swap the position of dialog buttons

- Swap the position of dialog buttons

# Conflicts:
#	projects/editor/src/app/app.module.ts
#	projects/editor/src/app/services/dialog.service.ts
#	projects/editor/src/app/services/unit.service.ts

- Add translations for operators
- Improve and extend the evaluation of visibility rules

This hack allows the page tabs to have a pseudo tab to create a new 
page.
This tab is disabled so the user can not change to it, but is still 
clickable.

They are treated as containers by the player and therefore have no
values that can be queried.

- Fix typo in css classname

- Refactor directive

- Basic implementation