* Use async function in PlainTextInput * Clean up PlainTextInput * Refactor logic from {Rich,Plain}TextInput into own files * Remove prohibited tags on content.subscribe which also parses the html
* Move remove-prohibited-tags logic from PlainTextInput * Make CodeMirror export a promise * Offer lifecycle hooks for PlainTextInput for easily accessing code mirror instance * Fix </> breaking Mathjax * remove debug statement (dae)