The cooldown is currently 3 seconds as suggested by this thread
also adds a nifty proc to Aiming to set said cool-down, it's variable.
The proc is "aim_cooldown(x)" with x being the time you want them unable to aim.
Also corrects the in-view logic. Now checks if the aimer can see the target, not if the target is within a given radius. Fixes#11926.
Cleans up Destroy() code a bit.
