for type text and image

- Rename class name, methods and properties
- Remove method registerDropListValueIds
- Calculate array of DragNDropValueObjects in app component

Use the mapper method `toUnitState` of the UnitStateElementMapperService
when registering elements and their initial values

Use configuration and refactor keyboard template

- Add fieldset to make it look nicer.
- Improve image to have fixed size, scale properly and show buttons only 
on hover.
- Improve translations
- Add tooltip to actionparam dropdown: When having selected pageNav it 
shows a tooltip to get across that only valid pages can show up.

#240

#243

For now only consisting of unit tests.

The sanitizer is now a service, so it is testable.
Since it uses the IDService it needs to be a real service as well.

Both are used by the player therefore moved to common.

- Clearer methods with only one return value
- better naming
- comments

Delete keyboard module

- verona
- unit-definition-menu
- key-input

This is possible since now playerState also has the information of the
underlying scrollPages

since the player uses it as well

- add unit-definition-menu module
- add verona module and move verona services and verona interfaces to it
  to make them available in different modules
- move the distinction of different page types to app component to make
  them available for unitDefinitionMenu component

The package karma-spec-reporter is to show more info about run tests on 
the console.

Numbers on the test files refers to the version (2 digits for minor; 
patch number ignored).

Just innerHTML does not work properly because the Material stylings do 
not take effect. Just using another element (div in this case) solves 
the issue.

New name: richTextOptions

Unit definition version has been raised accordingly.