Added bookmarks

• Added:
- bookmarks for GabPRO members only
- migration for creation of StatusBookmarks
- all necessary routes, controllers
- redux for adding, removing, fetching and displaying bookmarks
- bookmark icon
- doorkeeper scopes
- backend and frontend support

Bookmarks behave like likes/favorites, except they aren't shared with other users and do not have an associated counter.

dfea7368c9

app/javascript/gabsocial/assets/bookmark_icon.js

@@ -0,0 +1,24 @@
+const BookmarkIcon = ({
+  className = '',
+  size = '16px',
+  title = 'Bookmark',
+}) => (
+  <svg
+    className={className}
+    version='1.1'
+    xmlns='http://www.w3.org/2000/svg'
+    x='0px'
+    y='0px'
+    width={size}
+    height={size}
+    viewBox='0 0 48 48'
+    xmlSpace='preserve'
+    aria-label={title}
+  >
+    <g>
+      <path d='M 39.06 0 L 8.94 0 C 8.16 0 7.53 0.63 7.53 1.41 L 7.53 46.59 C 7.53 47.16 7.88 47.68 8.4 47.89 C 8.57 47.96 8.76 48 8.94 48 C 9.3 48 9.66 47.86 9.93 47.59 L 24 33.52 L 38.07 47.59 C 38.47 47.99 39.07 48.11 39.6 47.89 C 40.13 47.68 40.47 47.16 40.47 46.59 L 40.47 1.41 C 40.47 0.63 39.84 0 39.06 0 Z M 39.06 0' />
+    </g>
+  </svg>
+)
+
+export default BookmarkIcon