* feat(multiple blend files): added example of multi blend file workflow
* feat(tools/auto_export):
* added collection_instances_combine_mode superseeds & replaces "export nested blueprints", with a lot more flexibilty
* added preferences & ui settings
* added (optional) use of marked assets as replacement for "autoExport" collection flag
* added correct cleaning up of temporary sub_collections
* feat(tools/auto_export): change detection added for material changes
* feat(tools/auto_export): blueprints now also use the "combine" settings for nested collections
* feat(tools/auto_export): added correct cleanup of data when removing hollow scenes, so that there is no orphan data left behind
* feat(tools/auto_export): changes to nested collections are now triggering change detection of root
(exportable collections)
* feat(tools/auto_export): now actually useful tracebacks using traceback.format_exc()
* various minor fixes, cleanups & UI description improvements
* docs(README): updated & fleshed out docs
* closes#87
* closes#86
* closes#85
* closes#79
* closes#61
* closes#68
* closes#41
* feat(bevy_gltf_blueprints):
* added support for nested blueprints
* added example/test for nested blueprints with multiple levels of nesting
* feat(tools/gltf_auto_export):
* implemented functionality to export nested blueprints/collection instances
* added add prefs to control nested blueprints export
* experiments with nested blueprints merge modes
* when exporting of nested blueprints is disabled, will not scan for nested blueprints
and thus no export them
* docs(): updated docs & added images for nested blueprints support
Mark Moissette