Show sound waves at player's OTM

[jhakonen]

Suggested by rdcl_be at: http://forum.worldoftanks.eu/index.php?/topic/433614-094-tessumod-wotteamspeak-integration-mod-v034-5112014/page__st__80__pid__9402472#entry9402472

Having the speak_stop_delay is a good feature, but it sometimes introduces some
confusion when two people have the icon and only one of them is speaking.

I cannot remember which game it was, but I've seen a version of this implemented
where the person currently actually transmitting has a voice icon with sound waves
coming out of it and the ones that have just stopped transmitting only show the
voice icon for a short time, without the sound wave representation.