MSVC project files

With r2288 I’ve updated project files for Visual Studio. It will probably break your existing setups but will be easier to maintain.

It introduces VCMI_global property sheet. It contains properties that are inherited by all VCMI projects. That way we need to set paths to libraries (like Boost) only in one place. And there is no need to touch project files.

I’ve written description how to edit property sheets in our wiki: wiki.vcmi.eu/index.php?title=How … %29#Global

IMPORTANT
You’ll need to download and extract new MSVC libraries pack: download.vcmi.eu/msvc-pack.7z

Sorry for any inconvienence it may cause. If you encounter any difficulties in compiling VCMI with new project files, let me know.