RefSeqCoordinateParser backport

Created by: tgrego

Description

This is an initial backport of the RefSeqCoordinateParser For now it is for testing purposes only (and for diff), please do not merge without extra testing. Some additional performance improvements can be made (swapping foreach with while shift)

Use case

Describe the problem. Please provide an example representing the motivation behind the need for having these changes in place.

Benefits

If applicable, describe the advantages the changes will have.

Possible Drawbacks

If applicable, describe any possible undesirable consequence of the changes.

Testing

Have you added/modified unit tests to test the changes?

If so, do the tests pass/fail?

Have you run the entire test suite and no regression was detected?