New macro system and stdlib additions

orchid-host/src/ctx.rs

@@ -18,7 +18,7 @@ pub struct CtxData {
 	pub spawn: Spawner,
 	pub systems: RwLock<HashMap<api::SysId, WeakSystem>>,
 	pub system_id: RefCell<NonZeroU16>,
-	pub common_exprs: ExprStore,
+	pub exprs: ExprStore,
 	pub root: RwLock<WeakRoot>,
 }
 #[derive(Clone)]
@@ -43,7 +43,7 @@ impl Ctx {
 			i: Interner::default(),
 			systems: RwLock::default(),
 			system_id: RefCell::new(NonZero::new(1).unwrap()),
-			common_exprs: ExprStore::default(),
+			exprs: ExprStore::default(),
 			root: RwLock::default(),
 		}))
 	}