Advance notification hotkey

**Issue by [brianschamel](https://github.com/brianschamel)**
_Thursday Mar 23, 2017 at 21:05 GMT_
_Originally opened as https://github.com/CQUI-Org/cqui/issues/421_

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For example, "Barbarians have been noticed near ", which, when you click on it, is _supposed_ to take you to where the barbarians are, but it doesn't work.

What I've seen of the various problem behavior (not responding to clicks 100% of the time, not showing the tooltip when moused over) seems to indicate a hitbox issue.

Instead of trying to fix that, I propose a hotkey that, when pressed will take you to the next notification's target, and remove it from the list.

The issue names no files or tests. Start by tracing the notification click behavior and the existing hotkey or input handling, then verify that the chosen key focuses the next notification target and removes it from the list.

Written by the indexing model from the issue text.