Move app/src (mostly) to flipper-ui-core/src

Summary:
This diff moves all UI code from app/src to app/flipper-ui-core. That is now slightly too much (e.g. node deps are not removed yet), but from here it should be easier to move things out again, as I don't want this diff to be open for too long to avoid too much merge conflicts.

* But at least flipper-ui-core is Electron free :)
* Killed all cross module imports as well, as they where now even more in the way
* Some unit test needed some changes, most not too big (but emotion hashes got renumbered in the snapshots, feel free to ignore that)
* Found some files that were actually meaningless (tsconfig in plugins, WatchTools files, that start generating compile errors, removed those

Follow up work:
* make flipper-ui-core configurable, and wire up flipper-server-core in Electron instead of here
* remove node deps (aigoncharov)
* figure out correct place to load GKs, plugins, make intern requests etc., and move to the correct module
* clean up deps

Reviewed By: aigoncharov

Differential Revision: D32427722

fbshipit-source-id: 14fe92e1ceb15b9dcf7bece367c8ab92df927a70

desktop/flipper-ui-core/src/store.tsx

@@ -0,0 +1,48 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import './global';
+import {createStore} from 'redux';
+import {
+  createRootReducer,
+  Actions,
+  State as StoreState,
+  Store,
+} from './reducers/index';
+import {stateSanitizer} from './utils/reduxDevToolsConfig';
+
+let store: Store;
+
+function initStore() {
+  const rootReducer = createRootReducer();
+
+  store = createStore<StoreState, Actions, any, any>(
+    rootReducer,
+    // @ts-ignore Type definition mismatch
+    window.__REDUX_DEVTOOLS_EXTENSION__
+      ? window.__REDUX_DEVTOOLS_EXTENSION__({
+          // @ts-ignore: stateSanitizer is not part of type definition.
+          stateSanitizer,
+        })
+      : undefined,
+  );
+
+  // For debugging purposes only
+  // @ts-ignore
+  window.flipperStore = store;
+  return store;
+}
+
+// grab store lazily, to not break module loading order...
+export function getStore() {
+  if (!store) {
+    return initStore();
+  }
+  return store;
+}