work in progress
Merge branch 'master' into feature/keep-media-filename-15326

* master:
  Use FileBinaryMimeTypeGuesser first
  Init page
keep media filename (#15326)
update unit tests
add default sorting (by name) in thumb/list view
fallback for bulk uploads - use filename as name
upgrade instructions
Merge branch 'feature/keep-media-filename-15326' into feature/folder-tree

* feature/keep-media-filename-15326:
  upgrade instructions
  fallback for bulk uploads - use filename as name
  add default sorting (by name) in thumb/list view
  keep media filename (#15326) update unit tests
  work in progress

Conflicts:
	AdminList/MediaAdminListConfigurator.php
	Controller/ChooserController.php
	Controller/FolderController.php
	Entity/Folder.php
	Entity/Media.php
	Form/File/FileType.php
	Form/RemoteAudio/RemoteAudioType.php
	Helper/File/FileHelper.php
	Helper/Menu/MediaMenuAdaptor.php
	Tests/Entity/MediaTest.php
	UPGRADE.md