Optimized rate limiter implementation

- Moved rate limiter scope into proxy router
- Give IpTable a better name following clean code guideline
- Optimized client IP retrieval method
- Added stop channel for request counter ticker
- Fixed #199
- Optimized UI for rate limit

src/mod/dynamicproxy/dpcore/header.go

@@ -91,7 +91,6 @@ func addXForwardedForHeader(req *http.Request) {
 					req.Header.Set("X-Real-Ip", strings.TrimSpace(ips[0]))
 				}
 			}
-
 		}
 
 	}