GPU memory support (#176)

* gpu memory demo

* fetch snapshot data on subsrciption

* move device added to the end

sources/awesome-widget/plugin/formatters/formatters.h

@@ -15,6 +15,8 @@
  *   along with awesome-widgets. If not, see http://www.gnu.org/licenses/  *
  ***************************************************************************/
 
+#pragma once
+
 #include "awpluginformatterac.h"
 #include "awpluginformattercustom.h"
 #include "awpluginformatterdouble.h"