Aliases should appear in nsc headers

[lyncmi07]

In order for type checking to work correctly, native aliases (and preferably not standard aliases) should make part of a NoSyn module's headers. If possible they should be hidden aliases, IE they work for the purposes of type checking, but attempting to use them in the file that imported them should fail. We would also want at some point for them to be imported at the programmers discretion using a scope modifier (similar to private/public in Java