Feature suggestion: trigger an announcement (and sound) when Gw is detected

[Stemuweb]

New setting added: Announce the appearance of Gw the pillager.

(maybe with a tooltip to warn the player it can only happen once the reticle goes over the enemy)

When Gw is detected for the first time (by any of the players), an announce would appear on the top of the screen and a sound could be played (it could the same as marauder's, as it is very noticeable).

In duo mode, for both players to hear it, it would require data sharing the signal.

[Flat-Badger-1971]

Added a sound to the marker detection code - not done data sharing as yet