Modernized dpcore code

- Rewritten dpcore transport object with deprecated API removed
- Optimized concurrent connection counts from 32 to 256
- Updated random port range for plugins
- Added debug output to plugin library

src/mod/access/loopback.go

@@ -21,7 +21,7 @@ func (c *Controller) StartPublicIPUpdater() {
 	go func() {
 		for {
 			select {
-			case <-stopChan:
+			case <-c.publicIpTickerStop:
 				ticker.Stop()
 				return
 			case <-ticker.C: