support creation variables with not-reified clazz and format

[tieskedh]

support:

• "a".of(String::class, "hi %S", "You".S())
• "a".valOf(String::class, "hi %S", "You".S())
• "a".varOf(String::class, "hi %S", "You".S())

[tieskedh]

Not tteified cclass is not going to be supported: doesn't add anything.