This adds a PlatformToolset tag for each configuration so that it is easier
to upgrade the projects to Visual Studio 2012/2013 formats, which are
largely the same as the Visual Studio 2010 projects. We can, for example,
use a script to change the values of the PlatformToolset to make these
projects usable out-of-the-box for Visual Studio 2012/2013.
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".
