Massive code changes and cleanup to allow wxPython to be split into

Massive code changes and cleanup to allow wxPython to be split into
multiple extension modules again.  A Python CObject is used to allow
the "export" of SWIG and other common helper functions from the wxc
module to other modules, even if they are in separate shared
libraries.  Should also be usable from 3rd party code, just include
wxPython/src/export.h

Changed the default setup so the following are built as separate
extension modules:  calendar, glcanvas, grid, html, ogl, stc, and
utils.  Will probably add more later.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@8984 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775