2sxc 08.04.02 with improved delete and more

Various improvements, especially

1. rename field is now possible
2. delete entity with force-delete
3. getting out of edit-dialog is now done with non-blocking question
4. improvement in wysiwyg when using floating images
5. when migrating a site, the messages are more helpful and a button to manage-apps is provided

full list https://github.com/2sic/2sxc/issues?q=is%3Aissue+milestone%3A%222sxc+v8.04.02+Hotfixes%22+is%3Aclosed