feat: upgrade platform and support webdav (#1047)

## Summary
- Upgrade platform from espressif32 6.12.0 (Arduino Core 2.0.17) to
pioarduino 55.03.37 (Arduino Core 3.3.7, ESP-IDF 5.5.2)
- Add WebDAV Class 1 server (RFC 4918) - SD card can be mounted as a
network drive
- I also slightly fixed the SDK and also made a [pull request
](https://github.com/open-x4-epaper/community-sdk/pull/21)

First PR #1030 (was closed because the implementation was based on an
old version of the libraries)
Issue #439

---------

Co-authored-by: Dave Allie <dave@daveallie.com>

src/network/CrossPointWebServer.h

@@ -1,14 +1,16 @@
 #pragma once
 
 #include <HalStorage.h>
+#include <NetworkUdp.h>
 #include <WebServer.h>
 #include <WebSocketsServer.h>
-#include <WiFiUdp.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "WebDAVHandler.h"
+
 // Structure to hold file information
 struct FileInfo {
   String name;
@@ -71,11 +73,12 @@ class CrossPointWebServer {
  private:
   std::unique_ptr<WebServer> server = nullptr;
   std::unique_ptr<WebSocketsServer> wsServer = nullptr;
+  WebDAVHandler davHandler;
   bool running = false;
   bool apMode = false;  // true when running in AP mode, false for STA mode
   uint16_t port = 80;
   uint16_t wsPort = 81;  // WebSocket port
-  WiFiUDP udp;
+  NetworkUDP udp;
   bool udpActive = false;
 
   // WebSocket upload state