* Fixes mech action button icon not updating whent the button is activated.
* Fixes internal tank action button icon not updating to off when we adjusted our masks out.
* Fixes mime/clown mask not updating their action button icon when adjusting. Fixes clown mask not updating
its on mob icon if adjusted when worn.
* Fixes typo in the human threshold for toxin in the air.
* Fixes changing the thermomachine circuitboard settings not giving any feedback.
* Fixes the lack of second argument in alien/stun()
* Fixes the sleeping alert not being updated properly when a mob asleep is killed then revived.
* Fixes timestop effect leaving mobs unable to move forever in some cases.
* Fixes teleporter hub and station staying active when the hub's panel is open, despite the hub's open panel sprite looking offline. The Hub and station now use their own iconfile icons/obj/machines/teleporter.dmi (similar what most machines have).
* I've moved all mob's status adjustment procs (Stun(), Paralyse(), blur_eyes() adjust_drugginess(), etc...) into specific files (named "status_procs.dm") so they're easier to find. I've added a third argument to stun adjustments procs to ignore the CANSTUN flag. I've also changed the weaken procs to have the ignore_canweaken argument be the third argument, so all status adjustment procs have amount as first arg, updating the mob or not as second, and when necessary an ignore_x as third arg.
These are the files with just tiny tweaks. Mostly modify an object's attackby so it does "return ..()" instead of "..()".
If there are other things in this commit, the PR's description will explain them.
Moves everything on a 15+ layer to a plane. So now you get screen catcher (-99, was already on a plane), lighting (15), effects that ignore lighting (16), fullscreen UI effects (18), screen objects used to build the UI (19), actual equipment in the UI slots (20), and everything else (0).
Also created a file to contain plane and layer defines for hopeful eventual use.
Hopefully this doesn't change anything now but does enable some nifty new features in the future.
