vs-2013 upgrade

Upgrade the project from Visual Studio 6.0 to Visual Studio 2013.

Fix q2.rc, afxres.h -> windows.h
Change 'common' code structure

Rename qcommon to common, qcommon.h to common.h and qfiles.h to files.h
Fix linux compile
Merge branch 'dschimmer-common-change' into integration
Fix make file for qcommon change