PNGs optimized with FileOptimizer. 249 files processed. 296,293 bytes saved (64%) Closes https://github.com/wxWidgets/wxWidgets/pull/333
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56245 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775