Funcotator - review and finalize data sources release numbers / versioning

[jonn-smith]

Need to look at how to version the releases of data sources and individual data sources.

This is exemplified with the dbSNP common vs dbSNP All problem.

[jonn-smith]

#4692 should be fixed in conjunction with this.

[jonn-smith]

We determined that dbSNP should have the all data.

Individual data sources will be versioned as well as the Broad-provided packages.

Broad-packaged data sources will be semantic versioned (see https://semver.org/) with the patch version corresponding to the date of release and any decorators on the data.

A decorator is an arbitrary string that adds information to the version. For instance, two data source releases may contain several overlapping data sources and some use-case specific ones (such as in the germline and somatic uses of the tool). For these two data source releases, they will have the same version number, but with different decorators.

Concretely:
funcotator_dataSources.v1.4.20180829g.tar.gz - germline data sources
funcotator_dataSources.v1.4.20180829s.tar.gz - somatic data sources