Adding scratch arena for main thread (and any thread in the future)

Added some function based on raddbg code for string conversion and more.

Game/Entity/EntityManager.cpp

@@ -12,7 +12,7 @@ void InitEntityManager(Juliet::NonNullPtr<World> world)
 
     newManager->Entities.Create(world->WorldArena JULIET_DEBUG_PARAM("Entities"));
 
-    newManager->Arena = Juliet::ArenaAllocate({} JULIET_DEBUG_PARAM("Entity Arena"));
+    newManager->Arena = Juliet::ArenaAllocate({ .Name = "Entity Arena" });
 }
 
 void ShutdownEntityManager()