Hmtnote

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* Add options to download the annotation database locally;
* Use local database to annotate variants (instead of calling HmtVar's API);
* Fallback to using local database when no internet connection is available;
* Check if local database actually exists before performing offline annotation;
* Databases are downloaded asynchronously.

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* Add warnings to ``hmtnote`` command to be compliant with future versions;
* Check internet connection before trying to annotate variants.

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* Add HmtVar ID of the variant in basic and full annotation;
* Change ``Disease Score`` annotation to ``DiseaseScore``.

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* Fix issue that prevented importing ``annotate_vcf()`` into Python scripts.

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* Fix issue with ``--predict`` annotation, which didn't retrieve the correct field from HmtVar.

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* Classes and methods are protected where needed;
* Code style is clean.