Uncertainty - Babelfish HGVS <-> VCF - Symbolic ALT and CIPOS/CIEND

* Add Symbolic ALT support to Babelfish ```<DEL>```, ```<DUP>```, ```<INV>```
* For uncertainty - support ```CIPOS``` / ```CIEND```
* Should work ```hgvs_to_vcf``` and ```vcf_to_hgvs```