added claiming for task interface

lib/buttontask/GwButtonTask.cpp

@@ -110,4 +110,14 @@ void handleButtons(GwApi *api){
     }
     vTaskDelete(NULL);
     #endif
+}
+
+void initButtons(GwApi *api){
+    #ifndef GWBUTTON_PIN
+    api->getLogger()->logDebug(GwLog::LOG,"no buttons defined, no button task");
+    return;
+    #endif
+    const String taskname("buttonTask");
+    api->addUserTask(handleButtons,taskname);
+    api->taskInterfaces()->claim<IButtonTask>(taskname);
 }

lib/buttontask/GwButtonTask.h

@@ -2,6 +2,6 @@
 #define _GWBUTTONTASK_H
 #include "GwApi.h"
 //task function
-void handleButtons(GwApi *param);
-DECLARE_USERTASK(handleButtons);
+void initButtons(GwApi *param);
+DECLARE_INITFUNCTION(initButtons);
 #endif