A container for each of the values in a GFF 2 line.
tabtabtabtabtabtab
tabtab[space delimited key=value; key=value; attributes]
Each param is split into a String[] on \t
Attributes are further processed splitting on ;\s into another String[] each
of theses Strings are then split into key value pairs on an = or \s and stuffed
into a LinkedHashMap
Note Stop = End +1, needed to convert to real coordinates!