Userstory: I have several levels with separate manifests. This manifests contains some part of the same assets. If I load second level after complete first, I don't want to load asset I previously loaded.
[x] check if asset has already loaded and skip download
Userstory: I have several levels with separate manifests. This manifests contains some part of the same assets. If I load second level after complete first, I don't want to load asset I previously loaded.