Switched to native ESP32 webserver

- new status API
- webdav without crashing

firmware/lib/basic/FilesystemAbstraction.h

@@ -74,6 +74,16 @@ namespace portablefs
     {
         return SPIFFS.mkdir(name);
     }
+    
+    inline size_t usedBytes() 
+    {
+        return SPIFFS.usedBytes();
+    }
+
+    inline size_t totalBytes()
+    {
+        return SPIFFS.totalBytes();
+    }
 
 } // namespace portablefs