WICKET-5124 Improve ResourceReference#getDependencies() API
WICKET-4972 Remove (or disarm) varargs contructors of StringResourceModel (more of a pitfall than convenience)

Change the type of "defaultValue" from String to IModel<String>
WICKET-4934 DownloadLink uses wrong encoding for spaces/non-ASCII characters
WICKET-4934 DownloadLink uses wrong encoding for spaces/non-ASCII characters