Batch FBX export for Blender

Exporter builds FBX jobs from selected or visible objects, parent groups, the active collection or an explicit export list, and previews prefixes, suffixes, Unreal asset-type names and collection-based folders before anything is written. It handles static meshes, skeletal meshes, animations and cameras, with Unreal handoff and fallback import scripts, and checks assets on the way out: existing LOD naming, collision and socket helpers, and root-bone export modes. It is still in development, so details may change before release.