Fix #17

  - Major refactoring and clean-up
  - In Delhi version newer than XE, enhanced RTTI is used to provide access to
    methods, fields and properties.  So in most cases you no longer need to
    create wrapping classes.
  - __published__ property was replaced with the implementation of the __dir__()
    method, so that you can do for example dir(MainForm) to inspect the
    methods, fields and properties of MainForm.
  - Demo 31 has been updated to test/showcase some of the new features.

Author: pyscripter