Search - all variant searches should report alternative references and alts

[davmlaw]

Issue split out of SACGF/variantgrid_private#3472

"There's no attempted substituting of refs or alts for IGV/Locus/VCF, only for HGVS searches."

Also reported against MT

Move out of HGVS into general purpose variant code if possible (or duplicate for other variant searches)

[davmlaw]

At same time do references as well

a. Deletion – searching for incorrect reference base - ENST00000361381.2(MT-ND4):c.279delG (instead of A)
b. SNV - ENST00000361381.2(MT-ND4):c.1A>C (instead of G) and
ENST00000361381.2(MT-ND4):c.1T>G (instead of reference base of A)
MT:10760 A>C (instead of G)
MT:10760 T>G (instead of reference base of A)
Expected output: Should show results with warnings