Fix EliteAPI and bug fix DirectorAPI

[xiaoxiao921]

• Fix EliteAPI : Was not working anymore because we are calling the CombatDirector.Init and it fill the arrays with null references since we are not early loading the game content anymore, the easy fix is to early load those specific defs which makes the whole thing work again, this is not proper and ideally everything should probably happen inside a IContentPackProvider, I added a todo comment which talks about this a bit more.
• Add a test to verify if the EliteAPI works or not.
• Fix a null ref that could happen with old stages with DirectorAPI