Uniform & attribute caching

utils/python_server.sh uses the right module for each python version

Editor: Integrate tern-threejs in script editor

Simplify example as per suggestions from @westlangley and @mrdoob

Proposed example that illustrates a way to convert geometry to buffer geometry

Fixed whitespaces and removed comma

Improvements to documentation

Dev

Add Multiple Elements example

Changed transparency to opacity

The OBJ to JSON converter uses now opacity instead of transparency
attribute.

Fixes #6645

shows a solution to trying to draw lots of different HTML elements
each with a different scene

Added GL call to disable attributes when reset is called. This fixes …

Protect against invalid pixel ratio