Basic appearance
Altered look a bit as a tab system was going to be ineffective to switch between modes.
Added video logic to switch with youtube, vimeo and manual embed code, but videos are still hardcoded.
Made sure that videos from Youtube and Vimeo are found using regex, else default to the inputted video url.
Made sure correct classes are added
Made sure responsive styles are not partially added when not needed
New icon for toolbar button
Description + authoring