This is a commit that needs testing

Migrated Thomas dl3el's patches for SPIFFS preferences.cfg.

taskTNC can initiate the storage of preferences.cfg file,
and can show the runing config.

In taskWebserver we now do anti-idle on the connection.

Signed-off-by: Thomas Osterried <dl9sau@darc.de>

data_embed/index.html

@@ -729,7 +729,7 @@
             <div>
                General<br>
                <ul>
-                 <li>There could be two files: wifi.cfg and preferences.cfg. You find them are in sources tree in the directory "data/". </li>
+                 <li>There could be two files: wifi.cfg and preferences.cfg. You find them in sources tree, below the directory "data/". </li>
                  <li>Each file should not exceed 2560 bytes.</li>
                  <li>To upload both files to SPIFFS of your board, you have to do this via Upload File System image in PlatformIO!</li>
                  <li>To find the 'Upload File System image' click the PlatformIO symbol (the little alien) on the left side, choose your configuration, click on 'Platform' and search for 'Upload File System image'. If you use platformio-cli, upload the filesystem as described below.</li>