[Implemented] Canceling SOS call

[Mr. NB]

I am suggesting a new button for the SOS system, or maybe just a simple "!cancel" command, that would cancel the SOS call and inform the services that have responded on it, about the call being canceled. A simple red-colored line in the chat would do the job, but a "/rcm" message would be perfect.

If it was the additional button that was implented, it could of replaced the SOS button, if any service has responded on a call. If not, there would be no need for that.

I am suggesting that, becouse what sometimes happens, is that the caller already gets helped before the arrival of the police, paramedic or a tow and even if he does mention it in the chat sometimes, this message could be quite hard to notice, especially on a full server, while you, as either of those, are in the rush and are focusing on the road mainly. So, you often do not realise that, before you arrive on the scene, which is empty. Well, if you are following the tracker all the time, you might aswell notice that the caller is moving, but sometimes this is hard to notice.