2. wxArtProvider::Remove() now really only removes the provider without
deleting it, Delete() does delete it
3. moreover, ~wxArtProvider removes the provider as well so there is almost
no need to call Delete() explicitly any more
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41398 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Addresses:
printf-format warinigs
indentation/style
unused variable warnings
used wxID_ABOUT for about menu entry
removed references to "minimal sample" in other samples
some other misc warinigs
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16339 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
