Cooldown fix and minor changes

[Ramza13]

Summary

None

Purpose of change

Fix #73587
Removed attack_chance member which did nothing.
Changed gun special attacks to not consume moves if the creature is out of ammo.

Describe the solution

Describe alternatives you've considered

Adding a flag to monster attacks to make them still able to waste time when out of ammo. For ferals and whatnot it doesn't make sense for them to just sit there not throwing a rock but maybe turrets should? I don't think it matters enough though.

Testing

Used line "cooldown": { "global_val": "test", "default": 3 }, in feral throw attack.

Additional context

[Maleclypse]

Can this line be removed then? bool strict = src == "dda"; it's blocking this from passing.