bevy_proto_bsn asset improvements and rename (#185)

* Add retain_scene_with and retain_child_scenes_with

* Relax type bounds by replacing Clone/Default derives with manual impls

* Expand the list of registered ReflectConstruct for upstream components

* Rename bevy_bsn -> bevy_proto_bsn

* Rename .bsn -> .proto_bsn

* Rename bsn macro -> pbsn

* Add workaround/hack for loading assets using @-syntax in .proto_bsn-files

* Add Prefab component for more convenient BSN asset spawn/reload

* Rename bevy_bsn folder -> bevy_proto_bsn

* Add ReflectedBsn as an alternative ready-to-patch BSN asset

* Simplify and fix prefab bugs

* CI please 🤞

Author: villor

Cargo.toml

@@ -73,7 +73,7 @@ bevy_focus = { path = "bevy_widgets/bevy_focus" }
 # general crates
 bevy_editor_core = { path = "crates/bevy_editor_core" }
 bevy_asset_preview = { path = "crates/bevy_asset_preview" }
-bevy_bsn = { path = "crates/bevy_bsn" }
+bevy_proto_bsn = { path = "crates/bevy_proto_bsn" }
 bevy_editor = { path = "crates/bevy_editor" }
 bevy_editor_camera = { path = "crates/bevy_editor_camera" }
 bevy_editor_launcher = { path = "crates/bevy_editor_launcher" }

crates/bevy_bsn/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "bevy_proto_bsn"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bevy_proto_bsn_ast = { path = "src/ast", version = "0.1.0" }
+bevy_proto_bsn_macros = { path = "src/macros", version = "0.1.0" }
+
+bevy = { workspace = true }
+thiserror = { workspace = true }
+variadics_please = { workspace = true }
+
+[lints]
+workspace = true

crates/bevy_bsn/examples/bsn_asset.rs

@@ -0,0 +1,13 @@
+(Transform, Visibility::Inherited) [
+    (
+        SceneRoot(@"alien.glb#Scene0"),
+        RotateMe,
+    ),
+    (
+        PointLight { shadows_enabled: true },
+        Transform {
+            translation: Vec3 { x: 4.0, y: 8.0, z: 4.0 },
+        },
+    ),
+    Prefab(@"3d_scene_child.proto_bsn")
+]

crates/bevy_bsn/examples/bsn_asset_hot.rs

@@ -0,0 +1,7 @@
+(
+    SceneRoot(@"alien.glb#Scene0"),
+    Transform {
+        translation: Vec3 { x: 0.4, z: 0.3 },
+        scale: Vec3 { x: 0.5, y: 0.5, z: 0.5 },
+    }
+)