* MTL Loader support for map_Ks

* removed amature console log

`value[ 1 ] === 0` is repeated. Looks like it should be `value [ 2 ] === 0` the second time.

* Adds a BVH Loader & example #5524

* bVHLoader example fixed empty mesh errors.

* BVHLoader: replaced internal quaternions with THREE.Quaternion

* added BVHLoader example to example files

* removed arrow function notation

* BVHLoader example: replaced example animation.

ShaderChunk: Moved normal_flip out of envmap_fragment and normal_fragment. See fc1159a6.

Inherited material is overwritten if 'usemtl' declaration is encountered after the object starts but prior to next object start.
Exception to this is when faces have been declared to the inherited material, to keep MultiMaterial in sync.

Fixes #8792 and #8871.

* animation to animator keyframe variable name

* golden ratio align and descriptions

* text to description

* play with computed offset negative timeScale animation

* clampWhenFinished only for non-loop animations

* onComplete animation fix

* wrong variable reference

* remove check action.enabled is no longer necessary

* remove animationData.completed is no longer necessary

* sound animator and fix play( offset )

* mrdoob approves

* add clone asset example ( middle click to clone )

* optimization

* remove unnecessary .cullFace

* unify animation mixers

* Revert "unify animation mixers"

This reverts commit 97872707757c5eb7d454aa481b0bf0ee44183685.

* mixer.timeScale to action.setEffectiveTimeScale

* fix keyframe animation loader and clampWhenFinished

* removed not more necessary includes

* pause mixer update after finish non-loop animation

loadParts is not passing incoming worker from parameters to load issue fixed

* node material r5 + mirror nodes example

* threejs.min in node material examples

* sea3d update

* reverted to un-minified

* update mrdoob EventDispatcher.js

* fix eventdispatcher update

* proto defines replace by Object.assign

* native script support transferred to loader

* sound filters support

* light intensity from sound amplitude

* keep .setFilter() method

* get freq amplitude average

* cleanup

* use THREE.AudioAnalyser to get amplitude

* EventDispatcher: Deprecated .apply.

* EventDispatcher: Removed unit test for .apply.

* MTLLoader: Deprecate setBaseUrl in favor or better named setTexturePath.
Make sure MaterialCreator.baseUrl is not undefined if no path/texture path is set.

* MTLLoader: Automatically resolve texture base path from .mtl source URL if not explicitly set with setPath or setTexturePath.
The URL parameter to .parse(text, url) is passed in if you use .load(). For external use it is optional and preserves earlier behavior if not passed in.

* MTLLoader: Use single quotes consistently. Make params object property setting easier to read.

* MTLLoader: Don't overwrite already found diffuse texture like is done with bump map. This might change behavior for bad materials that define 'map_kd' multiple times.

* MTLLoader: Remaining double quotes to single ticks, also in documentation.

* MTLLoader: Remove auto resolving base path from .mtl source URL.
Add documentation to load and other important functions.
Remove now redundant call to .setBaseUrl in obj/mtl loader example. setPath is enough if the .mtl and textures have the same base path (documented).

* MTLLoader: Dont break parsed texture references that are already absolute URLs.

* MTLLoader: Fix doc typos.

* MTLLoader: Move utility function inside the function that uses it.

* MTLLoader: Use case insensitive regexp instead for abs URL checks.

* ObjLoader: Implement support for multiple materials inside a geometry/object.
- Tracks material declaration occuring mid face declaration
- If object has multiple materials MultiMaterial is creted and geometry groups are created.
- This approach is better than splitting into separate objects: 1) we are creating as many objects the file defines (correctness) 2) The full geometry would be duplicated into
  two objects, afaik this uploads the geometry multiple times to the GPU (perf, i had test asset that had >400 submeshes with 1-6 geometry groups each).

Fixes #8681 #8640
Updates #8203 (fixes OPs 2. point)

* OBJLoader: Code cleanup and three.js style formatting.

[This commit](https://github.com/mrdoob/three.js/commit/0f5e69cec8a13d9b9819565f04b5db466548538d#diff-96b1bdbd7110f611907545802eaa5805R913)  changed a `url_array` to `urls` which broke the loader + example page. This patches SceneLoader to use the same naming convention in other files.

When Wrap Mode data is missing, fallback to Collada spec default repeated wrapping. Without this change the wrapping is clamped to edge which should not be the default behaviour.