- Remove all Roboto files

Since there is just one font, this setting can be safely ignored. This 
is easier than sanitizing all elements.

- Send metadata as voeReadyNotification to host

This prevents the browser from trying to translate the page on
German systems

This is done according to the Angular best practices and minimizes
namespace collisions when using other packages which might use the same
selectors.

Technically the selectors are not even becessary since we use an Angular
component factory to create element components but it is still useful
for the DOM element naming, for debugging purposes for example.

Will be replaced by new editor module. See subsequent commits.

The old one has bugs, like not setting background color. It also relies 
on deprecated API features, which may stop working any time.
TinyMCE did not exhibit any bugs so far.

This is the basic installation. rework of the whole DialogService and 
it's editors follows.

The latest change to page width and ratio needs to be reflected by a 
version change.

- Replace in the projects 'editor' and 'player' the selector
'app-root' with 'editor-aspect' or 'player-aspect' and make a
case distinction unnecessary
- Remove definitions of the property 'local' in `environment`
and `angular.json`