4th Prerelease of FB4D

Improvements and correction for accessing Firestore

3rd Prerelease of FB4D

Fix Realtime DB Listener for automatic token refresh

2nd Prerelase of FB4D

Fixed asynchronous storage upload
Extended storage page in the Intro sample application to show synchronous versus asynchronous calls for all commands

Prerelase of FB4D.

There are still open points in code to solve and the wiki needs also more content.