Split error macro into two versions (format vs non-formating) to allow format checking at compile-time

examples/PhysicsPlayground/main.cpp

@@ -251,7 +251,7 @@ int main(int argc, char* argv[])
 		std::shared_ptr<Nz::Mesh> spaceshipMesh = fs.Load<Nz::Mesh>("assets/Spaceship/spaceship.obj", meshParams);
 		if (!spaceshipMesh)
 		{
-			NazaraError("Failed to load model");
+			NazaraError("failed to load model");
 			return __LINE__;
 		}