Headset tweaks

Headsets now broadcast to the entire tile regardless of whether they are on your ears.  Previously, they would broadcast to the entire tile ONLY if they were on your ears as a human.  Headsets that are not created on a mob start off.


>I can keep a bunch of headsets in my pockets or if implanted and it will still work.
This is no different than station bounced radios. Station bounced radios have the same volume no matter where they are, why would headsets be any different. Also, you can't talk into headsets anywhere besides your ears or in your hands using :r or :l(which both of these only allow interaction with the common channel).

The purpose of this pull request is to make headsets stop magically becoming louder because they are on a human's ears. This also allows other mobs to listen to active headsets on their tile(which is useless for most mobs).

Also, this removes snowflake allowing for more mobs to possibly use headsets in the future.