Coherence update

Audio: GetListenerDirection was using ALfloat and GetListenerRotation
not.
ByteArray: Two return *this, hazh is perturbing, is it intended ?
String: Same ?
Camera: Adds of security (don't think it's usefull)
Parser: size() = 0 -> empty()
Utility: update 13 to 14 was forgotten
VertexDeclaration: same

Former-commit-id: f6db5cd15e5a4dc5ac2af12366b18d1f6922b0e0

src/Nazara/Audio/Audio.cpp

@@ -62,7 +62,7 @@ NzVector3f NzAudio::GetListenerPosition()
 
 NzQuaternionf NzAudio::GetListenerRotation()
 {
-	float orientation[6];
+	ALfloat orientation[6];
 	alGetListenerfv(AL_ORIENTATION, orientation);
 
 	NzVector3f forward(orientation[0], orientation[1], orientation[2]);