Improve export menu with multi-object export, multi-scene export, more control #828
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Previously, not all cases of selecting multiple objects and exporting them were supported. Additionally, it didn't really make sense to export selections of e.g. Prefabs as a single GLB, since the intent was likely exporting multiple files.
This PR refurbishes the export menu and adds explicit options to export the selection as one single file or as multiple files.
Addtionally, scene assets can now be selected and exported.
Future work might include better options for resetting root transforms – currently selected transforms are exported in parent space which can be unexpected when multiple objects with different parents are selected (without their parents also being selected).