Graphics/SpriteLibrary: Fix missing initialization/uninitialization (fixes crash at exit)

Former-commit-id: c7bbd781d163a8456f1fadd0f71451adc5a1bd1a

src/Nazara/Graphics/Graphics.cpp

@@ -18,6 +18,7 @@
 #include <Nazara/Graphics/RenderTechniques.hpp>
 #include <Nazara/Graphics/SkinningManager.hpp>
 #include <Nazara/Graphics/SkyboxBackground.hpp>
+#include <Nazara/Graphics/Sprite.hpp>
 #include <Nazara/Graphics/Formats/MeshLoader.hpp>
 #include <Nazara/Graphics/Formats/OBJLoader.hpp>
 #include <Nazara/Graphics/Formats/TextureLoader.hpp>
@@ -89,6 +90,12 @@ namespace Nz
 			return false;
 		}
 
+		if (!Sprite::Initialize())
+		{
+			NazaraError("Failed to initialize sprites");
+			return false;
+		}
+
 		// Loaders
 		Loaders::RegisterOBJ();
 
@@ -181,6 +188,7 @@ namespace Nz
 		ParticleController::Uninitialize();
 		Material::Uninitialize();
 		SkyboxBackground::Uninitialize();
+		Sprite::Uninitialize();
 
 		NazaraNotice("Uninitialized: Graphics module");