Some refartoring to prepare for the bigger changes
Further refactoring and first wpf extensions
Bugfix of the window initialization and windows lookup test fix
Implemented children and descendants
Added Parent and Sibling functions
Implemented some essential properties (name, text, content, center).
Added input and wait. Time for some testing...
Implemented unit tests for WPF
Moved TestWindow tests to a separate files. All existing tests are passing.
Merge pull request #1 from pasho/WPF-only

WPF extensions ready