likes, mention parsing, lots of stuff

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Notifications.swift

@@ -37,6 +37,12 @@ extension Notification.Name {
     }
 }
 
+extension Notification.Name {
+    static var liked: Notification.Name {
+        return Notification.Name("liked")
+    }
+}
+
 extension Notification.Name {
     static var click_profile_pic: Notification.Name {
         return Notification.Name("click_profile_pic")