Provides the reading side with a per connection cache of
info obtained via calls to the remote CodeBase.
Previously, most of this was in IIOPConnection.
Delays cache creation unless used
Postpones remote calls until necessary
Handles creating obj ref from IOR
Maintains caches for the following maps:
CodeBase IOR to obj ref (global)
RepId to implementation URL(s)
RepId to remote FVD
RepId to superclass type list
Needs cache management.