Added support for defining macros in Rust within the macro system

Also fixed a lot of bugs

orchid-api/src/atom.rs

@@ -145,6 +145,16 @@ impl Request for ExtAtomPrint {
 	type Response = FormattingUnit;
 }
 
+/// Can specify the recipient of an atom as well. The main use case for this is
+/// to be able to return an atom to other extensions, so it can be combined with
+/// a [crate::Move].
+#[derive(Clone, Debug, Coding, Hierarchy)]
+#[extends(ExtHostReq)]
+pub struct CreateAtom(pub Atom, pub SysId);
+impl Request for CreateAtom {
+	type Response = ExprTicket;
+}
+
 /// Requests that apply to an existing atom instance
 #[derive(Clone, Debug, Coding, Hierarchy)]
 #[extends(HostExtReq)]