extern (Objective-C) interfaces with explicit method names.
Add implicit selector name generation for Objective-C member functions.
Add support for calling static functions (bound to class methods).
Add test for static member function bound to class method.

Also fixed an issue about reusing selector/class references multiple times.
Extracted objc class name symbol creation to its own function.
Partial implementation of class definition.
Creating a class now works.
Now correctly emitting protocol definitions.
Implicitly give Objective-C linkage to classes derived from one with Objective-C linkage.
Fix selector in method definitions in object file, and other things.
Improvements.
Static function semantics, wants metaclass 'this'.
Static members are working now, with rough edges.