Add legacy VS 2008 project files support and some bug fixes

• Add legacy VS 2008 project files support (merged from zhongpan pull request)
• Fix that in some conditions the tool could hang (this is due to a loop not terminating when it should: ac107ed )
• Solve that including a header whose name is a substring of another could cause the inclusion of the latter twice. E.g. #include <QString> may be converted to #include <QStringList> in the stdafx.h