Overhaul the Visual Studio 2010 Build Files

Like the Visual Studio 2008 projects, give the Visual Studio 2010 projects
an overhaul, where:

-The property sheets are split up, so that they are easier to maintain and
 each project only needs to include the necessary parts.  The various
 projects are updated accordingly, too.  The copying of config.h.win32 and
 clutter-config.h.win32(_GDK) are now done with custom build rules, so that
 these files can be cleaned and/or recopied during a clean, rebuild or
 update.

-Clean up the property sheets, to get rid of parts that are actually
 repeated.  Also update the build macros, so that we won't get warnings
 for repeated #defines of macros and fix the build of the various tests/
 demo programs.

-Make all projects use Unix line endings, except for the .sln and
 README.txt files, which need to have Windows line endings.  This makes it
 easier to apply patches to these project files.

-Update the installation of headers, as headers are introduced/deprecated.

-Cosmetics: get rid of "\ No newline at end of file".