Various Errors From trying to parse various editor blocks

[vshesh]

Eg:

• Missing positional component for Json/YamlComponent and the like
• AnnotatedCode returns the wrong type of JSON, because Template needs to be extended with custom components.
• no idea what is going on with codebyside/matrix/sidebyside. it looks like it should work - everything is {tag, attrs, body} but it keeps saying that it is expecting strings.
• figure just says "cannot convert value of type None" which means null is being returned somewhere in the parsing chain.
• list can't parse '' either...

[vshesh]

Ohhhhh style elements are dictionaries and they need to be strings...

[vshesh]

some of these have been fixed. the style tag issue is fixed, the None issue is fixed.
the positional component and the List one need some more work.
AnnotatedCode now spits out the right kind of error, but the real fix is to make it work with the frontend.