Export the complete scene hierarchy and all animation data with it

[bartteunis]

Extend the idea of the armature export and include all instances in the Blender scene/selection that have animation data (e.g. also a static mesh object that moves and rotates, scale won't work because of DQs being used). This should allow the export of fairly complex scenes to a single SMF model file.

Related issues:

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[bartteunis]

Note that this can already be done with the current exporter in a somewhat complicated way by disconnecting bones and moving them relative to their parent bone. SMF allows - or perhaps rather, "doesn't prevent" - this for detached nodes. So adding this would mainly be a feature that greatly improves the ease of use of the exporter when working with more complex animations in Blender (moving instances, several hierarchies, ...)

[bartteunis]

A couple of interesting reads releated to this issue:

• https://devtalk.blender.org/t/reevaluating-worldspace-and-localspace-treatment-need-some-dev-triage/9665/22
• https://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro/Parenting

In short: Blender also uses a parent inverse matrix. This is set at the time of parenting the child to the parent and has to be taken into account!