This adds a PlatformToolset tag in the project configs so that we can
provide support for Visual Studio 2012 with relative ease as the format
of the VS 2012 projects are only slightly different from their VS 2010
counterparts.
We can then use a script like the one used in GLib[1] to copy the VS2010
projects and replace the necessary tags to create the VS2012 projects.
This also cleans up the projects and property sheets, as there were some
unwanted/unneeded entries in them.
[1]: http://git.gnome.org/browse/glib/commit/?id=76cecf061b377d30e5422cdddb1fb9d19c52421d
-Turn on Whole Program Optimization for all Release builds.
-Disable Incremental Linking for all Release builds.
-Use MultiByte character set for all configurations for consistency.
-Change ATK dependency back to atk-1.0.lib, and the corresponding include
folder back to atk-1.0 for all projects as ATK-2.x will still retain the
1.0 suffixes. (ATK Commit 01cec72)
-Update corresponding description in the VS README.txt files
-Also fix up the VS2010 README.txt file a bit.
-Added projects to compile the a11y portion of GTK+. This is now necessary
as a11y/GAIL is now integrated into the main GTK+ library, and it must
be built before compiling/linking GTK+. This project is done like the
GDK/GTK+ projects, where the source file listings for the VS2008/2010
projects are fed into templates (.vcprojin, .vcxprojin and
.vcxproj.filtersin) during 'make dist'
-Added projects to compile the libgail-util DLL (no templates for this
as this does not have source files added/removed often)
-Added the new projects into distribution, and headers, DLLs and .LIB files
into the "install" stage
