title: cppcheck skips .hpp files
body: <p>I have a heavily templated project that is using the system of having a <code>.h</code> file with the function declarations <code>#include</code> a corresponding <code>.hpp</code> with the function definitions. However, <code>cppcheck</code> doesn't seem to parse the <code>.hpp</code> files, and I don't see an option to change the file extensions that it parses. How do people usually handle this?</p>