created clip block node

app/node/block/gap/gap.h

@@ -18,16 +18,17 @@
 
 ***/
 
-#ifndef TIMELINEBLOCK_H
-#define TIMELINEBLOCK_H
+#ifndef GAPBLOCK_H
+#define GAPBLOCK_H
 
 #include "node/block/block.h"
 
 /**
- * @brief Node that represents the end of the Timeline as well as a time traversal Node
+ * @brief Node that represents nothing in its respective track for a certain period of time
  */
 class GapBlock : public Block
 {
+  Q_OBJECT
 public:
   GapBlock();