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

- 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

Overwriting styles of HTML elements can lead to unwanted side effects

The height of an empty droplist can't be calculated on ios 14
because it's in a flex container

Change import paths of CommonModule files in editor and player

- Use `inputmode` 'none' to hide the virtual keyboard of the os
- Use DeviceService to detect if the player is running
on a mobile device

to ensure that a section that is not displayed has no dimensions

Call emitter in template and remove unnecessary method

Sections use the mediaStatusChanged event, which is also used to map the
interdependence of media elements

This can be enabled for TextFields and TextAreas and shows a keyboard
at the bottom of the screen. This does NOT set the field to read-only
which is probably wanted in a situation where the system keyboard is not
to be used. For flexibility purposes it is not implicitly set and needs
to be set manually. The same goes for other input assistance settings,
which should not be used in addition to the keyboard but it is allowed.

The keyboard has an extra switch to additionally show french special
characters.

Move KeyInputModule to the modules subfolder
Create template file for AppComponent

Rename properties and events for keypads

Rename KeyboardComponent to KeypadComponent
Rename KeyboardService to KeypadService
Split LayoutComponent into LayoutPlayerComponent and
LayoutPagesComponent
Prepare the introduction of an additional keyboard

see commit #866a33c6

Replace custom pointer events with native pointer events

By default, text fields and areas only allow the input of keys from the
respective keyboard.

and in ElementFormGroupDirective

This is necessary because the sanitizer returns now an array instead of
the modified unit definition.

Reduce the number of input parameters in FloatingKeyboardComponent
Move double-used method to KeyboardService