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/PSR7Streams.rst

@@ -0,0 +1,21 @@
+Usage with PSR 7 Streams
+===============
+
+PSR-7 streams are `standardized streams <https://www.php-fig.org/psr/psr-7/>`_.
+
+ZipStream-PHP supports working with these streams with the function
+``addFileFromPsr7Stream``. 
+
+For all parameters of the function see the API documentation.
+
+Example
+---------------
+
+.. code-block:: php
+
+    $stream = $response->getBody();
+    // add a file named 'streamfile.txt' from the content of the stream
+    $zip->addFileFromPsr7Stream(
+        fileName: 'streamfile.txt',
+        stream: $stream,
+    );