Richt text Editor for RichTextBlocks

[jogibear9988]

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Infos:

At the Moment we could show a simple RichTextEditor, but only for each simple element. We should check wich Elements are only text and show a rich text editor for them as a combined text.

Also the included rich text editor should be massively extended, at the moment we have a sample of "stylojs" integration, this could and should be expanded. But also our internal one should get a better toolbar, with more options.

Task:

We need a better Rich Text experience. There are multiple Rich Text Editor Frameworks in the wild (like StyloJs, CkEditor, TinyMCE) wich we could use a a reference (or include them). So we need a consistent way to switch to ContentEditable (for some components), and then edit inside, and also leave it again and use the edited content. This also needs to be included in our undo stack.