Processing Framework Multi Product Support

Make PF support multiple products.

There is an example in the mod folder, the only thing you need is to add a modextension as instructed in the example. The efficiency indicates the output/input ratio which has the same meaning to the main efficiency, but the outputs are calculated separately (so it's not ingredient count * main efficiency * output specific efficiency, it's just ingredient count * output efficiency).

I think the example def is pretty straightforward, so if you have any questions, please ask.

PS: This mod does not add any content, it just makes it easier to add products for PF recipes.