comments: add scores, rework comment menu.

* Add comment scores.
* Rework voting buttons so that you can click the upvote/downvote
  buttons to toggle votes.
* Hide the edit, delete, undelete, and report buttons behind a popup menu.
* Show the upvote/downvote/reply buttons to logged out users. Redirect
  them to the login page instead.

app/components/popup_menu_component/popup_menu_component.js

@@ -10,8 +10,11 @@ class PopupMenuComponent {
       target: "a.popup-menu-button",
       placement: "bottom-start",
       trigger: "click",
+      animation: null,
       content: PopupMenuComponent.content,
     });
+
+    $(document).on("click.danbooru", ".popup-menu-content", PopupMenuComponent.onMenuItemClicked);
   }
 
   static content(element) {
@@ -19,6 +22,12 @@ class PopupMenuComponent {
     $content.show();
     return $content.get(0);
   }
+
+  // Hides the menu when a menu item is clicked.
+  static onMenuItemClicked(event) {
+    let tippy = $(event.target).parents("[data-tippy-root]").get(0)._tippy;
+    tippy.hide();
+  }
 }
 
 $(document).ready(PopupMenuComponent.initialize);