As we are likely to have GTK+-2.x around for some time, revamp the Visual
Studio 2010 projects like what was done for rest of the GTK+ stack, namely:
-Split the property sheets, in a way like what was done for the rest of the
stack. Also clean up the resulting property sheets a bit, and update the
projects to use these property sheets.
-Use UNIX line endings for all projects and property sheets, to ease future
application of patches.
-Make the copying of config.h.win32 and gdkconfig.h.win32 into custom build
rules, so that they may be removed properly and re-copied during change
and update.
-Add a PlatformToolset tag, so if we want to support building with Visual
Studio 2012/2013, the transition can be done quite easily with a script,
such as what is now being done for the Visual Studio 2012 projects for
GLib.
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