* Add new Settings
* Use new settings instead of old ones
* Implement AllowedUploadedFiles value to be copied to AllowedUplayedFileExtensions
* Obsolete old settings
* Rename DisallowedUploadFileExtensions
* Implement same fix for DisallowedUploadFiles
* Use new settings for backoffice server variables
* Update the correct setting
Co-authored-by: Zeegaan <nge@umbraco.dk>