treeview: properly remove the timeout in expand_collapse_timeout()

or it will later warn about removing a source that doesn't exist.
Visual Studio 2008 Projects: Revamp the Projects

As we are likely to have GTK+-2.x around for some time, revamp the Visual
Studio 2008 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.

Similar updates will be applied for the Visual Studio 2010 projects ASAP.
Visual Studio 2010 Projects: Revamp the Projects

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.