Menu item controlling which instances are expanded/collapsed (#1007)

Adds a menu item (like "Quick Jump") for options related to displaying
instances. This provides functionality for:

  * expanding/collapsing all instances on the currently opened page
  * controlling whether instances are expanded/collapsed by default
  * controlling whether the state of instances should be "remembered"

This new functionality is implemented in Typescript in `details-helper`.
The built-in-themes style switcher also got a revamp so that all three
of QuickJump, the style switcher, and instance preferences now have
the same style and implementation structure.

See also: https://mail.haskell.org/pipermail/haskell-cafe/2019-January/130495.html

Fixes #698.

Co-authored-by: Lysxia <lysxia@gmail.com>
Co-authored-by: Nathan Collins <conathan@galois.com>

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