Prefab hash bug

[johnklipi]

Sometimes units use wrong prefab despite having the prefab set. One time opening the game, prefab shows properly, but after closing and opening the app, it can bug and show wrong one.

Example:
Bugged prefab:

Prefab immediately after reloading the application without changing anything:

[johnklipi]

Issue is caused by the implementation of GetSkinnedHashKey:

	private static int GetSkinnedHashKey(UnitData.Type type, TribeType tribe, SkinType skin)
	{
		return (int)(type + (int)tribe * 1000 + (int)skin * 1000000);
	}

it kinda assumes value is lower than 1000, but our values are more or equal. we need to rewrite the way game does hask keys for prefabs completely.