WICKET-5706 ResourceUtils.getLocaleFromFilename cannot handle filenames with classifiers
No need of concurrency in ResourceUtils#isoLanguages/isoCountries. We just read from them
Revert "WICKET-5350 remove wildcards from #ofList() and others"

This reverts commit ee41e39a5695bef0f6fc3c31b38e5f78de21d018.

Revert to make Wildcard**Model classes deprecated.
WICKET-5350 remove wildcards from #ofList() and others

Reapply ee41e39a5695bef0f6fc3c31b38e5f78de21d018 by just making Wildcard**Model classes deprecated, instead of completely removing them.
WICKET-5350 Use Model.ofList()

Java 7 diamonds