Move batch configuration to front of setup

[CaptainN]

Right now, the only chance the user has to configure a batch is after they setup everything, and get an batch reference. Should be able to pass a config item with an added layer, when adding it.

[CaptainN]

As part of this, I probably also need to create a factory for shader programs. This way, if the user knows they'll never use opacity or a tint on a set of Actors, they can use the config object to avoid the (costly on iPad 1) mul op in the fragment shader. If I pair that with a singleton of some kind, there are other optimizations that can happen in there, like a way to check for unnecessary state change operations between layers/batches.