Add a shortcut to jump to any model instance

[knyghty]

I would guess we can somehow hook into search_fields to to have a shortcut that:

When g is pressed followed by c (for change, could be something else?), a dialog should pop up.

This should have a selectable list of models reused from the g l shortcut.

When a model is selected, a new input should appear in which you can type in a string that will run a partial match on that model, probably using the admin's search_fields functionality (somehow).

Then you click choose one of the results and go directly to the change list page for that instance.