1. Use standard sample icon, avoid badly looking #ifdef __WXMSW__s
2. Use "modern" (i.e. this century) wxToolBar API, simplify code by
not allocating the bitmaps on the heap and deleting them any more
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43470 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775