Checks membership of a string x in a string array
    vec. Returns true if an exact match is found in any
    element of vec, otherwise returns false.
x – the string to locate.vec – the array of strings to search through.hit – true if x matches any
      entry in vec, false otherwise.This function is inlined for performance and used by PGx phenotype mapping routines to classify alleles.
function inArray input String x; input String vec[:]; output Boolean hit; end inArray;