Changes listed below:
* Makes Death Sounds mutable on their own audio channel.
* Makes Ear Ringing use the HUD Channel for sounds
Additions:
* [Adds On Fire effect](https://streamable.com/c1fxeo)
* Adds Stunned effect(https://streamable.com/v2if0s)
* [Adds SMES humming based on power usage in/out. Affected by walls, will only play if in LOS and visible.](https://streamable.com/z41x90)
* [Adds Atmos Alerts making a noise on the monitor](https://streamable.com/uhegq6)
* [Tcomms + PDA servers hum when powered and active, also respects walls/LOS](https://streamable.com/vb08x1)
* [Fridges hum quietly while powered](https://streamable.com/c3zsz7)
* [Point Defense turrets now make a sound audible from inside the station when firing, to add more spice to meteor waves.](https://streamable.com/bf8mwl)
* Shield Generators now hum when active.
- Instead of using auto_use_power to re-tally up machinery's power usage every cycle, track the steady "static" load separately from the transient "oneoff" usage. Machines then only need to inform the area when they use oneoff power or *change* their steady usage.
- Remove auto_use_power and stop SSmachines from calling it.
- Add vars to track "static" usage for each of the three power channels to /area
- Rename the existing three vars to "oneoff" so its clear what they mean (and to catch people accidentally updating them directly)
- Update area power procs and APCs to use the new variables.
- Rename /area/proc/use_power() to use_power_oneoff() to make it clear what it is doing.
- Deprecate /obj/machinery/use_power() in favor of use_power_oneoff() but don't delete yet. Can transition gradually.
- Add logic to the update_power procs on machines to calculate the deltas and update static area power whenever their usage changes.
- Add logic to machines to update area power when they are created, destroyed, or move.
- Moved /obj/machinery procs related to area power usage into machinery_power.dm to make them easier to find.
- Added or updated comments in several places to explain what is going on and how to use it.
* Combat Mechs Can Punch More Things
Removes the var to check for the 5 things it can attack, instead it can punch anything (but not everything will take damage).
Gives punching objects a check so you don't accidently smash something without meaning to.
Gives closets and canisters a proc to take_damage so they'll actually get smashed by the mechs.
* Take_Damage Boogaloo
* More take_damage Stuff
Adds click delay on attacking barriers.
Proper noises when attacking material doors and barricades.
More stuff can be broken by mech punch and simple mobs.
* Adds changelong
* usr to user
