Contraption Lights (Bi-directional Coloured Dynamic Lights)

Adds a second lighting backend built on Veil alongside the original LambDynamicLights path. Pick it with the new mode setting (LAMB, VEIL, OFF); LAMB stays the default and is unchanged.

VEIL mode (needs Veil; plus Sable for sub-levels):

• Colored light per source - froglights green, soul lanterns cyan, glowstone warm, etc.
• Crisp angled shadows from a tilted sub-level's own blocks.
• Optional world-to-structure lighting (off by default): world torches/froglights can light a passing build.
• Contraptions get the same color, brightness capping, and enclosed-light skipping as sub-levels.

Beta: This mode is new and for non-shader setups right now. If you run Iris shaders, use LAMB for the moment.