Modernisation of streamulus

After a 3-year stroll in javaland, it's time for me to get back to C++, and what better way than upgrading streamulus to use modern C++ features?

 There will some API breaking changes, but hopefully they will be obvious and appreciated (such as, InputStream<T> instead of typename InputStream<T>::type). I will blog about changes that are not obvious.

Please stay with an older version until you are ready to migrate client code to the new API.