X3D: basic initial port to blender2.8.

That was a rather heavy work, since in 2.7 that add-on was still using
tessellated geometry API quiet extensively (and that one has been
removed from 2.8)...

Also updated some minor things on the road, like e.g. exporting
ColorRGBA for vertex colors, since ours now have some alpha.

Main remaining TODO is materials afaik (those need to be ported to the
new nodeshader wrapper), not very high priority for now.

Also note that the whole code has many sub-optimal handling, but that
whole format is not really designed for heavy geometries anyway I think,
so this is probably fine for now (and going over whole code to optimize
it would be quiet a work too).

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