v2.15.0 to use Ethernet_Generic library

### Release v2.15.0

1. Use new [Ethernet_Generic library](https://github.com/khoih-prog/Ethernet_Generic) as default for W5x00.
2. Sync with `arduinoWebSockets v2.3.6`
3. Add examples and rewrite all the examples to support new features
4. Update `Packages' Patches`

Author: khoih-prog

README.md

@@ -2464,7 +2464,7 @@ Message from Client :  { now: 181506 }
 
 ---
 
-#### 15. [Portenta_H7_WebSocketClient_Sticky_SocketIO](examples/Portenta_H7/Ethernet/Portenta_H7_WebSocketClient_Sticky_SocketIO) on Portenta_H7 using Ethernet
+#### 15. [Portenta_H7_WebSocketClient_Sticky_SocketIO](examples/Portenta_H7/Ethernet/Portenta_H7_WebSocketClient_Sticky_SocketIO) on PORTENTA_H7_M7 using Ethernet
 
 The following are debug terminal output when running example [Portenta_H7_WebSocketClient_Sticky_SocketIO](examples/Portenta_H7/Ethernet/Portenta_H7_WebSocketClient_Sticky_SocketIO) on Portenta_H7 using Vision-shield Ethernet.