Move dispatcher into a subdirectory

We're expecting to have a whole bunch of types for the dispatched payloads, so pull the thing into a directory we can throw them in.

src/actions/MatrixActionCreators.js

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import dis from '../dispatcher';
+import dis from '../dispatcher/dispatcher';
 
 // TODO: migrate from sync_state to MatrixActions.sync so that more js-sdk events
 //       become dispatches in the same place.

src/actions/RoomListActions.ts

@@ -23,7 +23,7 @@ import { _t } from '../languageHandler';
 import * as sdk from '../index';
 import { MatrixClient } from "matrix-js-sdk/src/client";
 import { Room } from "matrix-js-sdk/src/models/room";
-import { AsyncActionPayload } from "../dispatcher";
+import { AsyncActionPayload } from "../dispatcher/dispatcher";
 
 export default class RoomListActions {
     /**

src/actions/TagOrderActions.ts

@@ -18,7 +18,7 @@ limitations under the License.
 import Analytics from '../Analytics';
 import { asyncAction } from './actionCreators';
 import TagOrderStore from '../stores/TagOrderStore';
-import { AsyncActionPayload } from "../dispatcher";
+import { AsyncActionPayload } from "../dispatcher/dispatcher";
 import { MatrixClient } from "matrix-js-sdk/src/client";
 
 export default class TagOrderActions {

src/actions/actionCreators.ts

@@ -15,7 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { AsyncActionPayload } from "../dispatcher";
+import { AsyncActionPayload } from "../dispatcher/dispatcher";
 
 /**
  * Create an action thunk that will dispatch actions indicating the current