[Feature Request] Update error message for BafFileReader

[caroott]

Throw last error says unable to find dll if "Visual C++ Redistributable for Visual Studio 2012" is not installed. Catch this error and add a reminder to check for those.

  let baf2SqlHandle =
        if baf2SqlHandle = Convert.ToUInt64 0 then
            Baf2SqlWrapper.ThrowLastBaf2SqlError()
        else baf2SqlHandle
    let mutable linq2BafSql = new Linq2BafSql(sqlFilePath)