Fixing CREDITS file

Removing many of clang warnings

include/openspace/interaction/controller.h

@@ -40,7 +40,7 @@ public:
 	Controller() :
 		_handler(nullptr)
 	{}
-
+    
 	void setHandler(InteractionHandler* handler);
 
 protected:

include/openspace/interaction/keyboardcontroller.h

@@ -34,6 +34,7 @@ namespace interaction {
 
 class KeyboardController : public Controller {
 public:
+    virtual ~KeyboardController() {};
 	virtual void keyPressed(KeyAction action, Key key, KeyModifier modifier) = 0;
 };
 

include/openspace/interaction/mousecontroller.h

@@ -37,6 +37,7 @@ namespace interaction {
 class MouseController : public Controller {
 public:
 	MouseController();
+    virtual ~MouseController() {}
 
 	virtual void button(MouseAction action, MouseButton button) = 0;
 	virtual void move(float x, float y) = 0;