fix: wrong parser behavior to Tr option with parameter invertTrProperty

* DRYer texture creation for different map types

Noticed there was a fair bit of repetition in each map line case. This pulls the case logic out into a reusable function

This also adds support for texture parameters for specular maps as a result. (Expands on #9311 and #9308)

* Change style of function declaration

* MTLLoader: Support for texture parameters

 -s u v w for scale (w is ignored)
 -o u v w for offset (w is ignored)
 -bm s for bumpmap scale

* Fix positional argument to get bumpmap scale

* Trim texture url to prevent trailing spaces

* Fix calls to getTextureParams (pass material parameters)

* Add missing 'var's

* 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.

* 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.

`kD` is set to the `color` parameter directly.