Space notification count

Show the number of notifications for a space if it isn't selected. This respects choices like low priority only adding highlights.

src/models/roomlistmodel.h

@@ -116,6 +116,11 @@ public:
      */
     Q_INVOKABLE [[nodiscard]] NeoChatRoom *roomAt(int row) const;
 
+    /**
+     * @brief The category for the given room.
+     */
+    static NeoChatRoomType::Types category(NeoChatRoom *room);
+
     /**
      * @brief Return a string to represent the given room category.
      */