Deprecate `get_most_severe_consequence_for_summary` in favor of more flexible `get_most_severe_csq_from_multiple_csq_lists`

[jkgoodrich]

Also adds:

• filter_to_most_severe_consequences, which is used by get_most_severe_csq_from_multiple_csq_lists
• Adds loftee_labels and no_lof_flags parameters to filter_vep_transcript_csqs_expr for filtering by loftee labels and flags.

Depends on #713

updates_to_get_most_severe_consequence_for_summary.html.zip testing to make sure the same results are returned for get_most_severe_consequence_for_summary