Refactor the way resources are loaded (#191)

* WIP

* WIP

* Font works

* WIP: Only Music remains

* Looks like it's working

* Fix oopsie

* Core/ObjectRef: Add cast functions

* Update ChangeLog.md

* Audio/SoundStream: Make sound stream thread-safe

src/Nazara/Graphics/GuillotineTextureAtlas.cpp

@@ -52,7 +52,7 @@ namespace Nz
 					return nullptr;
 				}
 
-				if (!newTexture->Update(image, Rectui(0, 0, image.GetWidth(), image.GetHeight())))
+				if (!newTexture->Update(&image, Rectui(0, 0, image.GetWidth(), image.GetHeight())))
 				{
 					NazaraError("Failed to update texture");
 					return nullptr;