Input type Proteins

[tillenglert]

Description of feature

This can be added later on if needed:

Microbiome of type proteins in sample sheet:

condition, type, microbiome_path, ...
cond_x, proteins, proteins.fa, ...

This can be used to directly input protein fastas, which are then split into peptides and the corresponding HLA binding affinities.

This type of input was originally planned, but due to time constraints, left out as unneeded atm, the corresponding dead code which was deleted can be found in PR: 112