add toggle function to pause/unpause sb::Animation

src/Animation.cpp

@@ -41,6 +41,11 @@ void Animation::unpause()
     paused = false;
 }
 
+void Animation::toggle(bool state)
+{
+    state ? unpause() : pause();
+}
+
 void Animation::reset()
 {
     timer.off();

src/Animation.hpp

@@ -74,6 +74,12 @@ public:
 
     void pause();
     void unpause();
+
+    /*!
+     * @param state  True to unpause, false to pause
+     */
+    void toggle(bool state);
+
     void reset();
 
     /*!