Fixed crash on Utility uninitialisation

Former-commit-id: ef9f53674fe21c4d7780e68c62f7981554663a85

src/Nazara/Graphics/Graphics.cpp

@@ -95,6 +95,10 @@ void NzGraphics::Uninitialize()
 	// Libération du module
 	s_moduleReferenceCounter = 0;
 
+	// Libération de l'atlas s'il vient de nous
+	if (NzFont::GetDefaultAtlas()->GetStorage() & nzDataStorage_Hardware)
+		NzFont::SetDefaultAtlas(nullptr);
+
 	// Loaders
 	NzLoaders_Mesh_Unregister();
 	NzLoaders_OBJ_Unregister();

src/Nazara/Graphics/GuillotineTextureAtlas.cpp

@@ -7,6 +7,11 @@
 #include <Nazara/Renderer/Texture.hpp>
 #include <Nazara/Graphics/Debug.hpp>
 
+nzUInt32 NzGuillotineTextureAtlas::GetStorage() const
+{
+	return nzDataStorage_Hardware;
+}
+
 NzAbstractImage* NzGuillotineTextureAtlas::ResizeImage(NzAbstractImage* oldImage, const NzVector2ui& size) const
 {
 	std::unique_ptr<NzTexture> newTexture(new NzTexture);

src/Nazara/Utility/GuillotineImageAtlas.cpp

@@ -73,6 +73,11 @@ unsigned int NzGuillotineImageAtlas::GetLayerCount() const
 	return m_layers.size();
 }
 
+nzUInt32 NzGuillotineImageAtlas::GetStorage() const
+{
+	return nzDataStorage_Software;
+}
+
 bool NzGuillotineImageAtlas::Insert(const NzImage& image, NzRectui* rect, bool* flipped, unsigned int* layerIndex)
 {
 	if (m_layers.empty())