XML import and export interface reviewed.
Show more infos about the error if app import fails
Added nicer error message when app installation fails.
Minor corrections in package manifest
Fixed: Required hyperlink field shows invalid message as soon as the form is open (before the user can input something)
Fixed issue: Enhance "required" field support
Font color of required field indicator is sometimes red (on a red background)
Fixed validation of number fields
Merge branch '2sxc-6.4' into SimpleDataImportExport
Missing files added.
Merge branch 'SimpleDataImportExport' of https://github.com/2sic/2SexyContent
Increased version numbers to 06.03.05
Fixed issue that prevents url parameters being lost after save (only when popups are active)