Examples: self -> scope

GCodeLoader Example: clean up

LDrawLoader (packLDrawModel.js) Fix LGTM error

Global: More clean up.

Sphere: Add makeEmpty function.

Examples: Refactor webgl_multiple_elements.

Global: Clean up.

Fix materialIndexLine debug printing in OBJLoader2Parser

Examples: Clean up.

Docs: Fix type in MeshPhysicalMaterial.

Update materialProperties.environment even if program doesn't change

Tests: update screenshots

TS: Fix ArrowHelper constructor types

The environment map can be switched to a different image while still using the exact same shader. It's important to update materialProperties.environment in this case so that unnecessary calls to initMaterial can be avoided. Prior to this fix FPS could be halved after changing scene.environment.

Revert "Tests: travis -> github CI"

Helpers: Properly specify the type property

Tests: travis -> github CI

Revert "Force context loss in renderer.dispose"