FIXED: install generated subs as methods

This replaces changes made in 0.40 that were then reverted in 0.41.
Now ensuring both:
- the declaring class has its type subs installed as methods
- the importing class does *not* also get methods installed
MooseX-Types-0.42-TRIAL

        - declared (not imported) types are now properly installed into the
          proper package, so they survive namespace::autoclean (fixed this
          time)