Release of v5.1.1-alpha1

Move all banners to GitHub. Adds library phpspreadsheet to JCB. Adds import item example to demo component. Updates the Superpower class with the GetRemote class in the plugin. Ensures the super power autoloader triggers the correct repositories.

libraries/phpspreadsheet/vendor/maennchen/zipstream-php/guides/FlySystem.rst

@@ -0,0 +1,34 @@
+Usage with FlySystem
+===============
+
+For saving or uploading the generated zip, you can use the
+`Flysystem <https://flysystem.thephpleague.com>`_ package, and its many
+adapters.
+
+For that you will need to provide another stream than the ``php://output``
+default one, and pass it to Flysystem ``putStream`` method.
+
+.. code-block:: php
+
+    // Open Stream only once for read and write since it's a memory stream and
+    // the content is lost when closing the stream / opening another one
+    $tempStream = fopen('php://memory', 'w+');
+
+    // Create Zip Archive
+    $zipStream = new ZipStream(
+        outputStream: $tempStream,
+        outputName: 'test.zip',
+    );
+    $zipStream->addFile('test.txt', 'text');
+    $zipStream->finish();
+
+    // Store File
+    // (see Flysystem documentation, and all its framework integration)
+    // Can be any adapter (AWS, Google, Ftp, etc.)
+    $adapter = new Local(__DIR__.'/path/to/folder');
+    $filesystem = new Filesystem($adapter);
+
+    $filesystem->writeStream('test.zip', $tempStream)
+
+    // Close Stream
+    fclose($tempStream);