restructuring name hiding around the notion of hijacking

[Andrei Alexandrescu]

Michel Fortin wrote:
> If I could attach my class-related data to the ClassInfo of a specific 
> class (so it could be retrieved at runtime) and if static functions had 
> access to the classinfo of the class they're called from (practically 
> making them member function of the corresponding ClassInfo) the 
> situation might be different though, and much less code would be needed.

It has crossed my mind more than once to put an Object userdata[string] 
member somewhere in TypeInfo or Classinfo (in fact the two will be soon 
merged). That way client code would be able to plant their own arbitrary 
data on a per-class basis.

Andrei