Hidden Tank Issue #327
Description
If a tank is hidden, it should become unhidden when another tank is on the adjacent tile.
Right now if a tank is hidden in a collection of trees another tank can roll up and collide with it, even though it remains hidden.
The hidden flag should only apply if the local tank is more than 1 tiles distance away--but if the local tank is next to the hidden tank, I think the hidden tank should be visible--or at least should be visible when the collision occurs