Start moving webapp to Redux (#6140)

* Start moving webapp to Redux

* Fix localforage import

* Updates per feedback

* Feedback udpates and a few fixes

* Minor updates

* Fix statuses, config not loading properly, getMe sanitizing too much

* Fix preferences

* Fix user autocomplete

* Fix sessions and audits

* Fix error handling for all redux actions

* Use new directory structure for components and containers

* Refresh immediately on logout instead of after timeout

* Add fetch polyfill

webapp/store/utils.js

@@ -0,0 +1,42 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+function transformFromSet(incoming) {
+    const state = {...incoming};
+
+    for (const key in state) {
+        if (state.hasOwnProperty(key)) {
+            if (state[key] instanceof Set) {
+                state[key] = Array.from([...state[key]]);
+            }
+        }
+    }
+
+    return state;
+}
+
+function transformToSet(incoming) {
+    const state = {...incoming};
+
+    for (const key in state) {
+        if (state.hasOwnProperty(key)) {
+            state[key] = new Set(state[key]);
+        }
+    }
+
+    return state;
+}
+
+export function transformSet(incoming, setTransforms, toStorage = true) {
+    const state = {...incoming};
+
+    const transformer = toStorage ? transformFromSet : transformToSet;
+
+    for (const key in state) {
+        if (state.hasOwnProperty(key) && setTransforms.includes(key)) {
+            state[key] = transformer(state[key]);
+        }
+    }
+
+    return state;
+}