Since there is still no native support for a inline ckeditor mode. ckeditor/ckeditor5#762 we will continue our hacky road ;)

This fixes several issues:
- Inserting text with newlines will now correctly insert soft breaks (br)
- We use our own pseodo `<neos-inline-wrapper>` tag to avoid the issue of having to parse html with regex and doing it wrong #2918

i also added a test for some inline editing behavior. (Like that there are no outer span or p tags)
But writing a tests for #2918 is currently impossible, as our tests currently dont use `https` which means we cant access the `navigator.clipboard` and test that ckeditor works correctly when content is pasted.

…HtmlUnclosedSpanTags

…nto headlines

Fix bug in the case you had multiple paragraphs and a headline and switched to autoparagrahp: false