Various progress, doesnt compile

Added prelude, made lambdas a single-token prefix like NS, made progress on implementations, removed const line type

orchid-host/src/extension.rs

@@ -293,6 +293,7 @@ impl Extension {
 	pub fn downgrade(&self) -> WeakExtension { WeakExtension(Rc::downgrade(&self.0)) }
 }
 
+#[derive(Clone)]
 pub struct WeakExtension(Weak<ExtensionData>);
 impl WeakExtension {
 	#[must_use]