Resolve "Fix visualization of objects with multiple meshes"

Closes #106 (closed)

assigned to @RainerKartmann

added 7 commits

• 5ee0ec99 - Remove unused class member
• c910a466 - Make an avi::core::Object have multiple meshes instead of 1
• c77d0079 - Enable model loader to load multiple meshes per object
• 362d04c0 - Enable model cache to support multiple meshes per object
• d30a7a88 - Enable ObjectElementNode to support multiple meshes
• de4311b5 - RobotElementNode takes first mesh of loaded meshes.
• b552b50a - (Probably) fix AABB code of MultiMeshElementNode (previously, it may have always contained 0 0 0)

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added 2 commits

• 4874cf37 - Avoid unneeded copies in loading / converting code
• cd34685d - Clean up

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marked this merge request as ready

FYI @paus.fabian

mentioned in commit e9fee34b

merged