Read a VCF into an MAF-like tableSource:
This function loads VCF files into MAF-like tables. A Tumor_Sample_Barcode column is added, and the contents of the POS/REF/ALT fields are converted to match the style used by MAF files for Start_Position/Reference_Allele/Tumor_Seq_Allele2. The VCF file should represent high-confidence somatic variant calls for a single tumor sample.
Vector of VCF file paths, or a list of VCF-like data.tables, or a single data.table.
Identifiers to populate Tumor_Sample_Barcode, one per VCF.