- 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.
- 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 circuit boards for shuttle consoles. (Ferry, Multi, and Overmap).
- Deconstructing a console saves the linked shuttle tag in the board for when it is re-constructed. New boards start blank but will auto-link if you build the console on a shuttle.
- Boards know what type of shuttle they can control and will only auto-link with a shuttle if it is the appropriate type.
Note: By default the only mapped-in shuttle consoles that are deconstrutable are overmap and multi shuttle consoles. For any others, consoles built mid-game will be deconstrutable but the mapped-in ones will not. That way the arrival, escape, supply ferry shuttles etc won't be messed with unless the mapper specifically chooses to override and make them that way.
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