* 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 !
* restrict main_menu system to only run in AppState::MenuRunning
* this is desired because hitting enter once we transition to AppState::AppRunning pressing enter will still trigger keycode.just_pressed in main_menu and set state to AppState::AppLoading and crash the game when it tries to create another scene, camera, etc...
* feat(examples): added basic_xpbd_physics example
* adapted code from rapier physics
* updated blend file & exported gltf files
* changes & tweaks to cargo files so the examples are scanned as they should be
* various minor tweaks
* refactor(examples): moved examples into more logic folders & changed to allow for per example dependencies
* chore(): updated docs, added docs, updated deps , cargo files etc
