* add method to find and persist embedded base64 (data-uri) images in a html string
* use method to find embedded images in the Umbraco.TinyMce and Umbraco.Grid property editors
* rename method to better reflect what it does
* set allowed upload file types for integration tests
* add test for embedded images in Umbraco.TinyMce
* let old ctor call new ctor
* Apply suggestions from code review
Co-authored-by: Nikolaj Geisle <70372949+Zeegaan@users.noreply.github.com>
* apply pattern matching
---------
Co-authored-by: Nikolaj Geisle <70372949+Zeegaan@users.noreply.github.com>