2sxc 08.01.00 BETA 4 with DNN8 support

Added

1. DNN 8 support (workaround for bugs in dnn8)
2. Toastr when saving in develop
3. Ctrl+s in develop
4. image-toolbar improvement in tinymce

https://github.com/2sic/2sxc/issues?q=is%3Aissue+milestone%3A%222sxc+v8.01.00+-+Many+new+features%22+is%3Aclosed