[Toybox] [PATCH] dd improvements.

[enh]

Support hex (requested by users).

Support status=noxfer and status=none (requested by users).

Fix status output.

Clarify large numbers in --help output.

Use O_TRUNC rather than ftruncate unless we're also seeking.

New tests.

Also partial cleanup (reuse of existing code, removal of non-GLOBALS globals,
and merge dd_main and do_dd).
---
 lib/lib.h         |   1 +
 tests/dd.test     |  13 +-
 toys/pending/dd.c | 349 +++++++++++++++++++++++++++---------------------------
 3 files changed, 188 insertions(+), 175 deletions(-)
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