Re-add banlist features

This effectively reverts commit b366290118.

server.py

@@ -39,6 +39,9 @@ def announce():
 	if ip.startswith("::ffff:"):
 		ip = ip[7:]
 
+	if ip in app.config["BANNED_IPS"]:
+		return "Banned (IP).", 403
+
 	data = request.values["json"]
 
 	if len(data) > 5000:
@@ -72,6 +75,9 @@ def announce():
 		server["port"] = int(server["port"])
 	#### End compatability code ####
 
+	if "%s/%d" % (server["ip"], server["port"]) in app.config["BANNED_SERVERS"]:
+		return "Banned (Server).", 403
+
 	old = serverList.get(ip, server["port"])
 
 	if action == "delete":