make about dialog boxes use standard wx about dialogs

Any information in dialog can be easily changed without much effort
and the dialog can be easy translated.

Unfortunately on Windows there is no good standard about dialog,
therefore own implementation is used there.

Beremiz's user manual
=====================

Contents:

.. toctree::
   :maxdepth: 2

   install
   start
   edit
   build
   connectors
   debug