Vendor dependencies for 0.3.0 release

vendor/bevy_reflect/src/std_traits.rs

@@ -0,0 +1,24 @@
+use crate::{FromType, Reflect};
+use alloc::boxed::Box;
+
+/// A struct used to provide the default value of a type.
+///
+/// A [`ReflectDefault`] for type `T` can be obtained via [`FromType::from_type`].
+#[derive(Clone)]
+pub struct ReflectDefault {
+    default: fn() -> Box<dyn Reflect>,
+}
+
+impl ReflectDefault {
+    pub fn default(&self) -> Box<dyn Reflect> {
+        (self.default)()
+    }
+}
+
+impl<T: Reflect + Default> FromType<T> for ReflectDefault {
+    fn from_type() -> Self {
+        ReflectDefault {
+            default: || Box::<T>::default(),
+        }
+    }
+}