Add PTM localization (and benchmarking)

[veitveit]

Description of feature

Currently, PTM localization only partly available and not added to the output files
Maxquant and PeptideShaker already provide localization and its scoring

• [ ] Find out what is already available within the used software and what needs to be added
• [ ] Adapt parameter settings: new parameters (e.g. threshold for localization score(s)) vs. using standard parameters
• [ ] Any special treatment for enriched samples?
• [ ] Add visualizations

@veitveit @david-bouyssie @pinaraltiner