Moved all reducers and actions to their own folders

ui/src/reducers/dialogReducer.js

@@ -0,0 +1,23 @@
+import { ADD_TO_PLAYLIST_CLOSE, ADD_TO_PLAYLIST_OPEN } from '../actions'
+
+export const addToPlaylistDialogReducer = (
+  previousState = {
+    open: false,
+  },
+  payload
+) => {
+  const { type } = payload
+  switch (type) {
+    case ADD_TO_PLAYLIST_OPEN:
+      return {
+        ...previousState,
+        open: true,
+        selectedIds: payload.selectedIds,
+        onSuccess: payload.onSuccess,
+      }
+    case ADD_TO_PLAYLIST_CLOSE:
+      return { ...previousState, open: false, onSuccess: undefined }
+    default:
+      return previousState
+  }
+}