Implement hotkeys for web UI (#5164)

* Fix #2102 - Implement hotkeys

Hotkeys on status list:

- r to reply
- m to mention author
- f to favourite
- b to boost
- enter to open status
- p to open author's profile
- up or k to move up in the list
- down or j to move down in the list
- 1-9 to focus a status in one of the columns
- n to focus the compose textarea
- alt+n to start a brand new toot
- backspace to navigate back

* Add navigational hotkeys

The key g followed by:

- s: start
- h: home
- n: notifications
- l: local timeline
- t: federated timeline
- f: favourites
- u: own profile
- p: pinned toots
- b: blocked users
- m: muted users

* Add hotkey for focusing search, make escape un-focus compose/search

* Fix focusing notifications column, fix hotkeys in compose textarea

app/javascript/mastodon/reducers/compose.js

@@ -25,6 +25,7 @@ import {
   COMPOSE_UPLOAD_CHANGE_REQUEST,
   COMPOSE_UPLOAD_CHANGE_SUCCESS,
   COMPOSE_UPLOAD_CHANGE_FAIL,
+  COMPOSE_RESET,
 } from '../actions/compose';
 import { TIMELINE_DELETE } from '../actions/timelines';
 import { STORE_HYDRATE } from '../actions/store';
@@ -214,6 +215,7 @@ export default function compose(state = initialState, action) {
       }
     });
   case COMPOSE_REPLY_CANCEL:
+  case COMPOSE_RESET:
     return state.withMutations(map => {
       map.set('in_reply_to', null);
       map.set('text', '');