Revision 3138

* Added new "Serialization" framework (and equally named namespace)
  which allows to serialize and deserialize native C++ objects
  in a portable, easy and flexible way.
* gig.cpp/gig.h: Added support for serializing & deserializing
  DimensionRegion objects (and crossfade_t and leverage_ctrl_t
  objects).
* Bumped version (4.0.0.svn15).