build
fun buildRefBlockVariantInfo(refSequence: Map<String, NucSeq>, chrom: String, currentRefBlockBoundaries: Pair<Int, Int>, assemblyChrom: String, currentAssemblyBoundaries: Pair<Int, Int>, assemblyStrand: String): AssemblyVariantInfo
Function to build a reference block AssemblyVariantInfo NucSeq is 0-based, so subtract 1 from the boundaries when grabbing the sequence allele