Configures the settings in include/wx/msw/setup.h.
Removes icons from include/wx/msw/wx.rc.
Deletes include/wx/msw/rcdefs.h (autogenerated by build process).
Updates .gitignore by including wxWidgets3.0 build files and adds a
missing '/' to build.
This configure the VS2013 files so that the now external libpng and
libjpeg libraries are used, and to place some of the common stuff into a
property sheet.
For deleted files, I've chosen to exclude from build instead of removing
them from the project file. It's less work to re-add them if they're
required at a later stage.
Jonathan Li