This PR reduces the tick rate of the lighting process from 1 ds interval to 10 ds interval, and removes some pointless updates from Destroy().
Also removes some left over defines from update_type and darkness overlays that I forgot to remove earlier.
Fixes#1683.
This PR simplifies the lighting update system (removes update_type) and instead makes the lighting system decide which update method to use based on server load.
Instant updates are used during low-load, scheduled during high.
Also removes: update_lights_now() (redundant), diff_light() (unused).
This is it. The big one.
Risk: Very large. This modifies or rewrites several important systems.
Some things still need balancing, but that's probably better done if/when this hits dev.
changes:
New smooth lighting system.
Machinery split into three processes: machinery, powernet, pipenet Removed due to breakage. Refactored into multi-step process.
Mob process rewritten.
NanoUI process rewritten.
Objects process rewritten.
Tweaked color output of station lights.
Slime core lights now emit colored light.
Fixed light update frequency issue with fire alarms, hydroponics trays, and airlocks.
Increased light emission from bolted airlocks.
Miscellaneous performance improvements.
New datum pool implementation.
New lighting usage profiler.
Lighting system now tracks UV light, which is not visible to players.
Space now has a parallax effect.
Disabled Spin View verbs due to incompatibility with the new lighting system.
Disabled hallucination view spin due to incompatibility with the new lighting system.
Lighting system now initializes in the lobby before the round starts to reduce BoR deadtime.
Added UV light tracking to lighting engine; dionae now gain energy exclusively from UV light.
Added colored lighting to a few consoles that used default (white) light.
