Define gcf with quiet mode parameter

Author: alandefreitas

source/matplot/core/figure_registry.cpp

@@ -79,4 +79,10 @@ namespace matplot {
         return h;
     }
 
+    figure_handle gcf(bool quiet) {
+        figure_handle h = gcf();
+        h->quiet_mode(quiet);
+        return h;
+    }
+
 } // namespace matplot

source/matplot/core/figure_registry.h

@@ -37,6 +37,10 @@ namespace matplot {
 
     /// \brief Get the current figure
     figure_handle gcf();
+
+    /// \brief Get current figure in quiet mode
+    figure_handle gcf(bool quiet);
+
 } // namespace matplot
 
 #endif // MATPLOTPLUSPLUS_FIGURE_REGISTRY_H