Task Sorting & Tools: support other line types #789

What is your feature request designed to achieve? (the 'why' not the 'how')
I'm after sorting other sorts of lines within a section: probably list items the most, but general text as well.

Describe the solution you'd like (the 'how')
I don't mind whether this is a separate command, or extending the existing mechanism. (Though given the 24 settings to cover all possible orders of open/done/scheduled/cancelled, adding further into that mix would need different UX.)

Describe alternatives you've considered
A third-party code editor, but that's not ideal for non-power-users.