Aa-stat

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- Fix 13 and a couple of issues with HTML report generation.
- Updated the following version requirements:

| Dependency | Required version |
| -----------|----------------- |
| Python | >=3.8 |
| Pyteomics | >4.6 |
| Pandas | >=1.4 |
| Jinja2 | >=3.1.2 |

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- Reduce memory usage.
- Fix errors with CSV files. Add new parameters --fmods, --vmods and --enzyme to make up for metadata that was
extracted from pepXML. Also new sections in config file can be used for the same purpose:
_modifications, configured fixed modifications_ and _modifications, configured variable modifications_.
- Add CLI argument --processes to control the maximum number of processes used.

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- Fix error message when no input files are found.
- Fix FutureWarrnings in HTML report generation.
- Fix error with DBSCAN min_samples parameter being float instead of int.

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- Fix a bug in `same_residue` which resulted in a KeyError when recalculating recommended modifications.

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- Fix the issue that clustering results were saved in the wrong directory.
- Fix number formatting in HTML report.

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- Add buttons to load, edit and save AA_stat parameters.
- Add `--create-shortcut` option for `AA_stat_GUI`.
- Refine GUI text, add tooltips.