Implement wxTimePickerCtrl natively for MSW and add a generic implementation
(very loosely based on the original class by Paul Breen) for the other
platforms.
Also update the calendar sample to show the new control.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69224 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
