Added option to duplicate first bar, in BBEditor

Added a new button to the action bar, using step_btn_duplicate.png

The new button, aswell as adding a bar to the patten, then
copies the first bar to the last.

fixes #457

BBEditor Duplicate Pattern. updated image, changed function name

Have updated the new image step_button_duplicate.png

Renamed the function from duplicateFirstBarAtEnd to duplicateSteps.

BBEditor renamed function duplicateSteps

renamed duplicateSteps() to cloneSteps() as requested

BBEditor rechange duplicateSteps to cloneSteps

BB Editor changed actionBtn text from duplicate to clone

include/BBEditor.h

@@ -82,6 +82,7 @@ public:
 
 public slots:
 	void addSteps();
+	void cloneSteps();
 	void removeSteps();
 	void addAutomationTrack();
 
@@ -91,6 +92,7 @@ protected slots:
 
 private:
 	BBTrackContainer * m_bbtc;
+	void makeSteps( bool clone );
 };
 
 

include/Pattern.h

@@ -127,6 +127,7 @@ protected:
 
 protected slots:
 	void addSteps();
+	void cloneSteps();
 	void removeSteps();
 	void clear();
 	void changeTimeSignature();