expose a few state props for debugging (#1008)

* expose a few state props for debugging

* rename h.appState & add h.setState

* support setting elements

src/tests/multiPointCreate.test.tsx

@@ -15,7 +15,7 @@ beforeEach(() => {
   renderScene.mockClear();
 });
 
-const { __TEST__: h } = window;
+const { h } = window;
 
 describe("remove shape in non linear elements", () => {
   it("rectangle", () => {