Allign highligthing correctly on files > 0xffff
Allign highligthing correctly on files > 0xffff

If a file is longer than 0xffff, the highlighting in the hex buffer when offset
is greater than 0xffff are misalligned, as the highlighting function expects
constant offset length (4 characters). The offset lenght can vary an this commit
takes account of that to perform the highlighting correctly

d0c-s4vage/pfp-vim