Add data explorer launcher (#23)

* Initial migration from ADO

* Bug fixes

* Fix bugs. Make active area smaller and require shift + ctrl + dbl click

* Add missing features

* Switch from HashMap to Map as it is already polyfilled

src/Explorer/Controls/FeaturePanel/FeaturePanelComponent.test.tsx

@@ -0,0 +1,11 @@
+import React from "react";
+import { shallow, mount } from "enzyme";
+
+import { FeaturePanelComponent } from "./FeaturePanelComponent";
+
+describe("Feature panel", () => {
+  it("renders all flags", () => {
+    const wrapper = shallow(<FeaturePanelComponent />);
+    expect(wrapper).toMatchSnapshot();
+  });
+});