Lathe geometry in the editor

Refactor example: webgl_shading_physical

Added a minimal support of lathe geometry in the editor.

Vector2: added angle() method

Removed deprecated code in other post-processing examples

LatheGeometry not processed by ObjectLoader

LatheGeometry is a standard geometry but it's not processed by
parseGeometries of ObjectLoader.

Dev: convert_obj_three_for_python3.py

Removed deprecated code in webgl_postprocessing_advanced.html

Add ETC1 compressed texture support.

Clarify clear() and add updateStyle to setSize()

Revert "add stencil properties to material"

emissiveMapIntensity => emissiveIntensity

Update MMDLoader Animation