Integrate `SelNextSurfaceCmd` and `SelPrevSurfaceCmd` into `Application`

src/Application/ProjectionMappingState.cpp

@@ -121,7 +121,12 @@ void ProjectionMappingState::onKeyPressed(Application * app, ofKeyEventArgs & ar
 		 }
 		 break;
 		 
-	 case OF_KEY_TAB:
+	 case '.':
+		 app->getCmdManager()->exec(new SelNextSurfaceCmd(app->getSurfaceManager()));
+		 break;
+		 
+	 case ',':
+		 app->getCmdManager()->exec(new SelPrevSurfaceCmd(app->getSurfaceManager()));
 		 break;
 		 
 	 default:

src/Application/ProjectionMappingState.h

@@ -10,6 +10,8 @@
 #include "RmGridRowCmd.h"
 #include "AddGridColCmd.h"
 #include "RmGridColCmd.h"
+#include "SelNextSurfaceCmd.h"
+#include "SelPrevSurfaceCmd.h"
 #include "TogglePerspectiveCmd.h"
 #include "SurfaceType.h"