slack: hide threads from the global view

To hide all comments from the same thread as the item at cursor, press
ctrl-h.

To later unhide everything, press ctrl-u.

Currently ctrl-u works by creating a whole new tab (that you can back
out of using Esc). That gives a way to undo it.

Still some rough edges:
  update number of items in view when hiding a thread
  avoid clipping menu in channel view
  undo a single hide without giving up previous ones

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