Separate NAZARA_API into multiple defines (one per module)

To fix inter-module dependency


Former-commit-id: 64704f020e0af22e529d38527323ba977187d4d0

include/Nazara/Renderer/Renderer.hpp

@@ -26,7 +26,7 @@ class NzShader;
 class NzTexture;
 class NzVertexBuffer;
 
-class NAZARA_API NzRenderer
+class NAZARA_RENDERER_API NzRenderer
 {
 	friend NzTexture;