Changed Bimap from a normal record into a class to hide implementation details.
Moved the implementations of the Bimap functions into members of the type.
Added a DebuggerTypeProxy for Bimap.
Changed IntBimap from a record to a class.
Moved the implementations of the IntBimap functions into class members.
Added a DebuggerTypeProxy for IntBimap.
Implemented the TagBimap module.
Merge branch 'master' of github.com:jack-pappas/ExtCore