Remove warning for used-before-defined.

Newer versions removed some of the package.json variables. Almost the 
same can be achieved by using a config object.

The other one used some deprecated functionality. Also we have more 
control over what is happening now.

Based on TipTap which in turn is based on ProseMirror. No further assets 
are needed.

Also add release notes document.

                                                         [style.height.%]="100"

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.

This uses kolkov/angular-editor.