Add option to make "Your Turn" indication more obvious

**Issue by [danfrom](https://github.com/danfrom)**
_Thursday Mar 02, 2017 at 00:53 GMT_
_Originally opened as https://github.com/CQUI-Org/cqui/issues/362_

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Hey.

I was wondering if it would be possible for you to intercept the "Your turn" chime, so that it also/instead showed the screen pulsating in red for a short while.
As some might have their speakers turned off or they did not notice that the turn was given back to them.

The issue identifies the “Your turn” chime and requests a brief red, pulsating indication, but names no file or test. First locate the turn-notification UI entry point in the Lua mod, then verify that the visual indication appears briefly when the turn returns and behaves as intended alongside the existing notification.

Written by the indexing model from the issue text.