Defined all the existing light_color values.
Moved their definitions to colors.dm
Made white the default color. It was so already, but that was very obscured.
Moved the atom light-related variables to the atom definition.
Wrapped changes to variables such as light_color into procs that report the event through signals.
Moved the light_on variable to the atom level, also adding a signal for its changing, to represent toggling lights.
Cleaned up a little bit of code in where new variables were defined before redefinitions.
This is all atomization to reduce changes in #52413
None of this affect gameplay at all, it's all code cleaning and refactoring.
There's more colors to standardize, a search for color = will find lots of targets, and I see little need to have both the LIGHT_COLOR and COLOR patterns, but I don't want to make this PR bigger than it already is.
Rohesie
6ff08e1c69