refactor(network): updated network and network::approx8 to use composition module

This is a very basic wrapper implimentation currently. This is sufficient to lock the interface down so that other code can target it. However, internally there is just a "convert" function. Eventually we should rework the code itself to use the composition module more directly.

src/composition/public/composition.h

@@ -18,8 +18,7 @@
 //   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 //
 // *********************************************************************** */
-#ifndef COMPOSITION_H
-#define COMPOSITION_H
+#pragma once
 
 #include <iostream>
 #include <string>
@@ -507,6 +506,4 @@ namespace serif::composition {
         Composition operator+(const Composition& other) const;
 
     };
-}; // namespace serif::composition
-
-#endif // COMPOSITION_H
+}; // namespace serif::composition