Do not play the shovel and rats events at the same time

[Cyber Killer]

In the intersection sequence if the player finds a shovel and doesn't take it with him, the sounds of rats are heard - this is incorrect. The rats event should play only if the shovel is not found in this particular event.

something like:
if(shovel found) - show shovel menu
else - play rats event

If the shovel menu is shown then the rats should not be played after that (they should play only after taking an another route at the intersection).

Found in 0.3

[Cyber Killer (cyber-killer)]

Additionaly make the shovel found event not play again after it has been found and left by the player.