[Implemented] Canceling SOS call

[Dan]

+111111111111 for this.

However you get the message across (that they have cancelled it) it will be so helpful rather than the emergency services responding to the scene.

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To add, I'm pretty fed up of driving to the other end of the map just to see a civillian has helped. Maybe if it's a dangerous situation, fair enough; however tipped over cars on pavements, can they just be left to emergency people? At the end of the day, we put [TOW] in our name because WE want to TOW; i can't stress to others (although it isn't a rule) to please leave the scene and let the specialist do their work.