- Added handling to not include parent of top-most list range selection
so that it's not also changed while not visually part of the
selection range.
- Fixed issue where list items could be left over after unnesting, due
to empty checks/removals occuring before all child handling.
- Added node sorting, applied to list items during nest operations so
that selection range remains reliable.
- Fixed new code block insertion to remove selection area instead of
just adding after.
- Added default table column widths to not be collapsed
- Updated table dom export to not duplicate colgroups.
