feat(emacs.d): Introduce custom mc/mark-dwim cursor marker r/155

Adds a "do what I mean" multiple-cursor selection with the logic that
I find most useful:

* If there is no active region, mark the next line (or lines, based on
  prefix argument)
* If there is an active region that spans multiple lines, call
  `mc/edit-lines`
* If there is an active region on a single line, trigger a custom
  selection hydra with functionality equivalent to
  `mc/mark-more-like-this-extended` but a slightly improved user
  experience

Hopefully this will make it easier to get into the habit of actually
using multiple-cursors without calling the mc commands via M-x

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