In the actions array of the Path, the last elements of the args array
need to be the x and y of the last point of the segment added to the
path.
Not the case with splineThru => cause an exception if you add an other
segment after the pline (without a moveTo).
Used the same trick as absellipse does.

the updateArcLengths in CurvePath must clear the local cache,
cacheLengths

Add Mesh.copy() to fix this.

white space and a few method tags

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.

pedant mode on.

camera, core and math  dirs + a stray "]" in WebGLRenderer docs

* First functional change

* Better HSL to RGB function

* Correct Padding

* HSL to RGB bad colors generation, fixed

* 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

* document object3d.getWorld* methods

* added full description of nature of optional parameters

* minor clarification