Project specific handling of primer trimming and output format

[samhunter]

Currently "dbcAmplicons preprocess" processes all projects within a single set of fastq files in the same way. However, some clients prefer to receive files with primers intact, others wish to have primers removed, and some would prefer 4-read format (R1, R2, I1, I2). It would be great if a more sophisticated configuration option could be provided to generate the correct output per-project.