main: add extra template for const pointer returning frozen object,
feature need to be tested/improved later.
wxColor: use wxTheColourDatabase to check if color name exist, add and
document predefined color constants
wxBrush: use wxTheBrushList to add singleton function, add and document
predefined brush constants
wxFont:add and document predefined font constants
wxPen: use wxTheBrushList to add singleton function, add and document
predefined pen constants