Improvements

• mat/RaymarchingBuilder has a roughness parameter to blur the environment map. Note that the roughness of this node and the one of its children gl/SDFMaterial are multiplied. See Breaking Change below.
• gl/SDFMaterial: improve refraction absorption, envMap rotation, add emissive and diffuse params
• sop/boolean: use newly created object to ensure boundingbox is correct
• the time delta is clamped to a maximum value.

Bug Fixes

• cop/SDFFromObject: fix bug would not recreate a texture when the expected resolution changes

Breaking Change

• mat/raymarchingBuilder: the environment used to be defined at the gl/SDFMaterial, but in order to have environment roughness, and since it is unlikely that materials will have multiple environment maps, those controls have been moved to the builder at the mat/raymarchingBuilder level.