Clean up property sheets and projects

I tried my hand at cleaning up the props and projects. The projects now have all more or less the same optimization settings, but I have no idea if some are vital and missing, so if anyone actually has some overview of those, input would be appreciated.
There are preprocessor definitions for x86 and x64, so #232 should be fixed with this, though there are like ten definitions for x86 I collected from all projects. I didn't look at the code much, so I'm not sure if some of them are not needed.
I tested building with Visual Studio 2013, so it (should) all work. I haven't touched the projects for older versions yet, because I'm not sure if it's enough to just compare diffs and manually copy over the changes, or if there's more to it.