Fix incorrect streamout buffer index in GS + refactor various code (#258)

src/input/api/Controller.h

@@ -189,7 +189,7 @@ public:
 	// update provider if settings are different from default provider
 	void update_provider(std::shared_ptr<TProvider> provider)
 	{
-		m_provider = provider;
+		m_provider = std::move(provider);
 	}
 
 protected:

src/input/motion/MotionSample.h

@@ -104,9 +104,7 @@ struct Quat
 class MotionSample
 {
 public:
-	MotionSample()
-	{
-	}
+	MotionSample() = default;
 
 	MotionSample(float acc[3], float accAcceleration, float gyro[3], float orientation[3],
 		float quaternion[4]