subclass wxXmlResourceHandler, etc...
Added wxGridAutoEditMixin to the mixins library package.
Made ColourSelect be derived from wxButton.
Fixed a few bugs here and there, added some missing methods, etc.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10588 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775