Move rtic macros to repo root, tune xtask

rtic-macros/ui/local-collision-2.rs

@@ -0,0 +1,18 @@
+#![no_main]
+
+#[rtic_macros::mock_app(device = mock)]
+mod app {
+    #[shared]
+    struct Shared {}
+
+    #[local]
+    struct Local {
+        a: u32,
+    }
+
+    #[task(local = [a: u8 = 3])]
+    async fn bar(_: bar::Context) {}
+
+    #[init(local = [a: u16 = 2])]
+    fn init(_: init::Context) -> (Shared, Local) {}
+}