Msbuddy

- Bug fix for MS/MS preprocessing.

- Update function `load_mgf`: 'FEATURE_ID' now is added as a new identifier for metabolite features.

- Bug fix for candidate formula generation (pre-ranking).

- timeout_decorator package seems not working on Windows, so we remove it.

- Update deep learning features & models for molecular formula annotation.
Now we use a learning-to-rank model to rank the formula candidates.
- Update MS2 preprocessing: reserve top 6 peaks (user-defined) for each 50 Da window.
- Update database source: now we use the GitHub release to manage the database source.
- Update candidate formula search, FDR estimation, ML etc.

- Bug fix for load_mgf (now can load metabolite features with MS1 and MS2 spectra using the same identifier).
- Update command line version.