BUG: (loadtxt) Ignore last empty field when delimiter=None
#21054
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When the delimiter is None and we are splitting on whitespace,
a final empty field is always ignored to match the behaviour
of pythons split:
" 1 ".split()
.Closes gh-21052
Opted for a slightly different variant of cleaning this up in hindsight. There is a small thing that the "skip leading whitespace" may need some thought if we were to make it public. But I think using the special "delimiter is whitspace" state here, helps with ensuring that things won't go weird.
This includes my "move to cpp" commit, I assume that will be merged so I don't need to worry about it here.