Ignore "decorated name length exceeded, name was truncated" Warning

Use of boost::mpl can result in some template instantations with very long names. Windows truncates these names into something more manageable with a warning to this effect. The internet seems to think that this is an innocuous warning (unless it isn't; there can arise linking issues, but we haven't seen these). The most common fix is to simply disable these warnings in "I know what I'm doing" parts of the code.