More options for outline core plugin

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Use case or problem

it is just so plain and simple right now

Proposed solution

some modifications that are necessary IMO

  • a collapse all option
  • an option to specify depth of headings (max_depth) for each note to be shown (like how it is in dynamic toc plugin but it is in side panes and always accessible).
  • add memory to outline setting so that it opens in the state it was closed


Current workaround (optional)

Related feature requests (optional)