uri: add path-query-fragment accessor

uri.hpp

@@ -100,6 +100,14 @@ namespace cruft {
         std::string_view query (void) const& { return get (QUERY); }
         std::string_view fragment (void) const& { return get (FRAGMENT); }
 
+        std::string_view
+        pqf (void) const& {
+            return {
+                m_views[PATH].begin (),
+                m_views[FRAGMENT].end ()
+            };
+        }
+
         // void clear (component);
         void clear_fragment (void);