* adds a new crate: ```bevy_registry_export``` to be able to create a json import of the registered component/type definitions
* adds a new Blender addon: ```bevy_components``` that takes that json data to generate custom UIs for components , to be to add & edit components easily in Blender
* also adds component metadata per object for more advanced features
* etc
* updates to bevy_gltf_components & bevy_gltf_blueprints to add legacy_mode to support the "old"/current style component definitions
* same with gltf_auto_export Blender add_on
* closes#60
* fundamental rewrite of a lot of aspects of the exporter, for cleaner code & to solve a number of issues
* set export_separate_dynamic_and_static_objects default to FALSE, as it is an edge use case
* added central tracker class, to track the post save & depsgraph changes
* auto_export is now more operator centric, with functional undo
* now storing add-on configuration at the blend file level (bpy.data.texts)
* found source of export issues ! mismatch between context.scene & context.window.scene (the last we can set, the other not)
* overhauled & cleaned up materials handling to avoid context issues & reliance on bpy.ops
* huge restructure of how temporary scenes are created & cleaned up
* added support for exports in edit_mode
* updated examples
* a lot more
* fixes#103
* fixes#112
* fixes#113
* fixes#114
* fixes#115
* fixes#116
* feat(bevy_gltf_save_load): saving & loading implemented
* created new crate for save & load features, uses & filters out blueprints for efficient loading
* saving & loading, even with dynamically spawned nested hierarchies works
* component filter , resource filter & save path root are configurable
* for saving: added removal & cleanup logic for children component with children
that have been filtered out: ie no more invalid children getting stored in the save files !
* added sending of event once saving is done
* feat(examples/save-load): example for the new crate
* loading level static & dynamic data as blueprints
* added a bit of ui when entering saving & loading states & cleanup when exiting
* feat(bevy_gltf_blueprints): significant rewrite of how the crate works
* simplified spawning process, no more spawning children containing blueprints etc
* simplified post process : instead of copying original entity into blueprint root
we now copy blueprint root data (components & children) into the original entity ! fixes#96
* much simpler code wise
* solves issue with needing to register components that we only use on the bevy side (not gltf)
since we are not copying the bevy data into the blueprints data
* added **copyComponents** helper to copy components from one entity to another, excluding existing
components on the target entity, & some bells & whistles
* **Name** is now optional when spawning a blueprint: closes#97
* **Transform** is now optional when spawning a blueprint: closes#98
* removed transform from bundle (BREAKING change)
* added (optional) **NoInBlueprint** component to have finer control over whether to inject the **InBlueprint** component inside spawned blueprint entities
* added (optional) **Library** component, so we can override library path when we want
* added (optional) **AddToGameWorld** component for convenience to automatically add entities to the game world, if there is one
* chore(bevy_gltf_components): removed verbose output, cleaned it up a bit
* feat(tools/auto_export): added option to split out "dynamic" objects in main scenes
* ie if a collection instance (or its original collection) has a "dynamic" (aka mutable, saveable etc)
flag it can get exported to a seperate gltf file (essentially acting like an "initial save")
* the rest of the levels (the "static" data) is exported without the dynamic objects and
can be reused with save files !
Mark Moissette