Create G recall command

* Add mapping for the recall command. Using `gG` because it's quick,
  easy to remember, and doesn't appear to be used for anything.
* Create `grappele#Recall()` function that goes to the last `G` count
* Store the most recent count passed into `G`

Using the recall command, you can `G` to the same count that you
previously used no matter what buffer you're now in.

TODO: The `G` command appears to be running slowly now for whatever
reason. Investigate what's going on.

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