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.
- Adds the update_idle_power_usage() and update_active_power_usage() procs for the respective vars.
- Switches all places modifying those vars directly to call the procs instead.
- This will let us react to the change appropriately, paving the way towards static area power.
- Adds update_power_channel proc for the sake of completeness, but no machines actually modify it so far.
Adds a new machine to telecomms, which contains special PDAs corresponding to each department on the station. Sending a PDA message to one of these PDAs will duplicate it to everyone in the department the PDA is assigned to. It determines what department someone is in by cartridge type.
Adds cartridges for several jobs that were missing them, for the purposes of being recognized as being in a department. The cartridges otherwise do nothing.
New circuitboard to build the new pda multicaster. It can also be deconstructed with the standard machinery deconstruction steps of screwdriver > crowbar.
