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.
Modified spawn_sync to include the spawning code, thus simplifying it's usage.
Modified spawn_sync to use actual time for failsafes.
A couple of sensibility tweaks for the wireless controller.
Cleaned up devices.dm to use new spawn_sync code.
Suggestions courtesy of @mwerezak
Added a changelog
Documentation, documentation, documentation.
Safety checks.
Reshuffled some code.
Modified wifi senders and receivers to both use var/id, instead of two different vars for basically the same purpose.
Added toggle variants for buttons, allowing them to "deactivate" connected devices.
Converted flashers and holosigns.
Fixes to keep in line with upstream.