* Remove Equirect Reflection/Refraction Mapping

* Reverted EquirectangularReflectionMapping and EquirectangularRefractionMapping removals.

* Added EquirectangularTexture and EquirectangularTextureLoader.

* WebGLCubeRenderTarget: Avoid using renderer.render() in fromEquirectangularTexture().

* WebGLBackground: Support EquirectangularTextures as background.

* Examples: Simplified webgl_materials_envmaps example.

* Fixed EquirectangularTextureLoader.d.ts

* Removed EquirectangularTextureLoader

* WebGLBackground: Fixed breaking when using Color as background.

* Examples: Fixed FBXLoader and LWOLoader.

* WebGLTextures: Moved cubeTexture code to its own class.

* WebGLCubeMaps: Handle CubeUVReflectionMapping and CubeUVRefractionMapping.

* WebGLCubeRenderTarget: Renamed isWebGLCubeTexture hack to isWebGLCubeRenderTargetTexture.

* Removed EquirectangularTexture

* WebGLCubeMaps: Simplified and fixed some breakage.

* Reverted more removals.

* WebGLRenderer: Check object.geometry before updating attributes.

* WebGLRenderer: Added getRenderList and setRenderList.

* WebGLBackground: Added WebGLCubeRenderTarget support back.

* Reverted comment removal.

* WebGLCubeRenderTarget: Avoid using mipmaps in fromEquirectangularTexture.

* WebGLCubeRenderTarget: Reverted generateMipmaps/migFilter/magFilter removal.

* WebGLCubeMaps: Added DataTexture support.

* Examples: Added more detail to sphere in webgl_materials_envmap.

* WebGLCubeRenderTarget: Improved LinearMipmapLinearFilter handling.

* WebGLCubeMaps: Added support for CompressedTextures.
Co-authored-by: NWestLangley <WestLangley@users.noreply.github.com>

WebGLBufferRenderer/WebGLIndexedBufferRenderer: Removed superfluous parameter. Thanks to @trusktr for pointing it out.

ShadowMaterial vertex shader needs to include common and have access to the view matrix to be able to apply shadow normal offset.

This reverts commit 511b2497