Introduced strongly typed QueryID.
Exchange between heroes is now a proper first-class query. Fixes #1269. #66 should also be finally fully fixed.
VC projects: /Zm flag to fix compilation issues with recent Boost.


git-svn-id: https://vcmi.svn.sourceforge.net/svnroot/vcmi/trunk@3388 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834