ecos shader for Canvas

changelog:

• update pack format
• reduce bloom
• massively reduce fog, densest at y 0
• change default film grain value from 3 to 2
• apply metal shader to iron door and trap door
• apply glass shader to all stained glass colors
• calculate in vertex: held light, vertex binormal, fog
• fix missing math lib import (affects can-pipe)
• fix item held light by halving the angle radius

experimental changes:

• add light block configurations for colored lights
• make colored lights affect ambient light color

note: colored lights require a special Canvas build