migrated FileClassLoaderTest from assertj to testory
migrated TempDirectoryTest from assertj to testory
inlined .lang.function.def.args.Helpers.createMap()
refactored arg.filterNameless() to return Multimap instead of Map
refactored ArgTest
refactored NameTest
refactored ConvertTest
refactored DiskFileSystemTest
removed JdkFileTester.assertContent()
fixed test name in RecursiveDeleterTest
inlined methods from JdkFileTester