OBJLoader: Allow flat and smooth shading within the same material definition for a specific object

Update Materials.html

Three.Legacy: Improve warnings

Docs typo ... NotEqualDepth returns true when Zincoming != Zcurrent, not when ==

SVGRenderer: Support LineDashedMaterial

It does not used if line contains the only segment

Fix lgtm.com alerts: equality tests

Clean up log messages

glTF 2.0 morph animation support

Improve performance of SVGRenderer

Update files.js

CatmullRomCurve3: Cleanup

Removes `webgl2_sandbox` example from the list, see #11363.

Such method can be used directly at the end of rendering loop

Update Group.html

XLoader clean up

Dealing with global pollution

Missing semicolon

While SVG is text format, 10-digits for each coordinate is overkill. In
many cases on can use precion=1 or even precision=0. For instance,
instead of 
path
d="M95.67875432291896,61.48774395485388L99.22967055503229,-179.38931463976644"

one gets (with precision 1)

path d="M95.7,61.5L99.2,-179.4"

This significantly (factor 2) reduces size of SVG when stored into the
file.