Lexical: Fixed code in lists, removed extra old alignment code

Lexical: Fixed code in lists, removed extra old alignment code

Code in lists could throw error on parse due to inner <code> tag being
parsed but not actually used within a <pre>, so this updates the
importDOM to disregard childdren for code blocks.

This also improves the invariant implementation to not be so
dev/debugger based, and to include vars in the output.