ColladaMax: Fixed import of bones based on SID. Bones support multiple roots, and different bones on instanced skins. When loading a skinned object, on a 2nd finalize the SkinImporter will check the originally created skin modifier bones list against the bones list provided in the ControllerInstance. If the bones do not match, the Derived Obj referencing the skin is cloned, assigned back to the node, and the import is finalized again onto the new instance. Exporting works in all tested cases. ColladaMaya: to do FCollada: Implemented sub id reading/searching etc. Implemented LinkExport/LinkImport on ControllerInstance in order to hook up local versions of bone lists, based on <skeleton> tag etc