* adds toJSON methods to scene and fog objects

* adds toJSON method to FogExp2

* adds fog instantiation to ObjectLoader.parse

* adds type info to fog JSON serialization and loading

* fixes unresolved conflict from rebase

* move is* properties to prototypes and remove unused ones

* rebuild

* merge dev -> less-is

* remove rebuild from PR

* convert to ES modules

* rebuild

* move shaders back into glsl files

* reinstate polyfills

- Better inheriting of `clone` + `copy` methods where appropriate. This is done by calling `new this.constructor()` in parent classes. `this.constructor` refers to the current instance's constructor, so it should all compose nicely;

- Pass in attributes directly as arguments to constructor when cloning, where appropriate (if arguments pattern is different from parent class). This mean `copy` isn't relied on to set those attributes.

- Change order of `clone` in some files (for better visibility into its relationship with `copy`, and to maintain consistency; can return to previous order if necessary);

- Fix CubeTexture's clone method

Fixes #5570

This fixes colada keyframe example but breaks helpers. Time to refactor Helpers...