Add TYPO3 12 compatibility
Still TYPO3 11 compatible
Remove TYPO3 10 compatibility
BUGFIX: Auto refresh AccessToken
Get image width/height by dropbox API
Render image preview with thumbnail provided by dropbox API
Show remaining time of current AccessToken in driver configuration
New client factory to use dropbox API nearly everywhere
New PathInfoFactory to create path objects for files and folders
New FlashMessageHelper to reduce complexity of other classes
Update documentation. New configuration section.