WIP: split libraries from SFFs

Design is to support:

* SFFs
* fasta
* fasta and qual

Specific parameters such as barcode type will be sourced from db. Finalizing this will require touching a few other areas of the codebase and a db patch, which I'll get to as they become necessary.

**This is not tested, and not mergable yet**
I encountered two of these instances were `NameError`s were happening due to necessary variables being set in try blocks but not set during an exception. It is possible there are a few more of these