HPCC-9382 Add EBCDIC support to HexView

Add more "printable" chars to ASCII view

Fixes HPCC-9382

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #4416 from GordonSmith/HPCC-9382

HPCC-9382 Add EBCDIC support to HexView

Reviewed-By: Kevin Wang <kevin.wang@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>