Currently, to_chat is literally just a proc that does user << message.
But it'll let us do output modification in the future, especially for
something like Goon's HTML chat.
Big thanks to PJB for his to_chat script, see
https://github.com/d3athrow/vgstation13/pull/6625 for more details.
Admin freezing is now based on mob procs, instead of a lengthy else-if
change.
Other changes:
- No longer depends on paralysis, instead uses sleeping.
- No more frozen mobs setting off bombs.
- Simple animals and slimes override the default proc to make freezing
affect them as one would expect.
- Frozen var has been moved from human defines to living defines, no use
yet.
- Mobs frozen are added to a global 'admin_frozen_mobs' list.
- List is used to determine if the freeze verb should freeze or unfreze.
- Moved mob freeze-related vars to freeze file.
