MAYBE:
  - Highlight groups:
    - Syntax highlight checkboxes and checkbox cookies
    - Separate syntax group for heading delimiters
    - Syntax highlight and indent "properties"
  - Inline blocks
    - Try to get text attributes to stack (e.g. underlined text in bold text)
    - Close inline block using same number of starting delimiters.
    - Set a max number of lines to search for end delimiter for bold/italic/etc. to 3 (might not be possible)

UNLIKELY:
  - Implement Emacs's abbreviations (e.g. '\<s<TAB>')