* OES_texture_float implies WEBGL_color_buffer_float

WebGLRenderer: Moved numClippingPlanes check. See discussion in c4684612.

* Adds THREE.UnsignedInt248Type and THREE.DepthStencilFormat constants

* Extends DepthTexture to allow for either THREE.DepthFormat or THREE.DepthStencilFormat

* Extends depthTexture initialization to support both DepthTextureFormat and DepthStencilFormat

* Fixes typos

* Ensures correct internal format for DepthStencil textures

* Allows to set depthTexture via options.depthTexture in constructor

* 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

* Fix for background clipping when using logarithmicDepthBuffer feature

* Changed subdivisions from 5 to 4

* Whitespace fix

* clear coat implementation.

* add physical variations to examples.

* add example file for physical materials

* adjust clearcoat range to 0-1 as original.

* switch example color to gray from yellow.

* Fixed for non-HTML documents

* Replaced Image constructor with createElementNS

* Merging WebGLTextures.js

This didn't commit for some reason

* Separated out WebGLClipping.

* WebGLClipping: Named internal functions.