Since we are linking in the resource items by the source, we need to
disable WholeProgramOptimization so that the resource stuff does get linked
into the demo binaries, so that they can be loaded properly.
Also make sure that gtk3-demo-application is also built with the multibyte
character set, like the rest.
This should fix bug 694342, at least for Visual Studio builds.
-Enhance optimization by turning on WholeProgramOptimization for all
Release builds
-Disable IncrementalLinking for all Release builds
-Make sure we are using MultiByte character set, to be consistent across
the board for all configurations
-Reinstate build/win32/vs10/gtk+.sln with the correct EOL (DOS/Windows), so
that it will be correctly recognized by Windows instead of having the
annoying "Unrecognized Visual Studio Version".
-Update property sheets to reflect on new headers added
-Change the demo program to be gtk3-demo.exe, to be consistent with the
names on other platforms, and updated/renamed related project/solution
files, and added overlay.c to the list of demo sources.
