Ling nerfs, ear protection cleanup, and ling bugfixes.

[Neerti]

Changeling shrieks (both kinds) now require the ling to not be muzzled or silenced in some form.
Sufficient ear protection (earmuffs-tier) will protect people from the confusing shriek.
A message is produced to any victims of the disorienting shriek.
Ear protection checks are now generalized in a get_ear_protection() proc, which returns the sum of ear protection from both ears and helmet slot.
Clothing now has an ear_protection variable. Earmuffs get 2, while helmets get 1, to be the same as how flashbangs worked previously.
Attacking while cloaked as a ninja or changeling will uncloak them.
Dead or unconscious changelings will now uncloak.
Cloaking as a changeling will now correctly deduct chemicals.

[Kelenius]

Attacking while cloaked as a ninja

This is a very DISHONORABURU tactic, but it's a serious nerf to ninjas, which already can get cucked pretty easily by a single stray bullet.