math_lightpattern

math_lightpattern is a new entity that replicates engine light patterns (the "Appearance" or "Custom Appearance" keyvalues on vrad lights, or the "SetPattern" input), firing outputs while iterating through a pattern of letters. It was created to help sync prop skins with lights and also allows for other entities like env_projectedtextures to use it.

(TODO: Elaborate on this stuff, show examples, mention using non-light patterns, etc.)