[Toybox] [PATCH] cp/mv: add -T.

[enh]

The kernel script scripts/kconfig/merge_config.sh uses cp -T.

(Also sort the options into alphabetical order while adding -T, so that
eyeball binary search actually works when trying to find an option! Oddly,
they all show in reverse order because there's a bug in the help text
generator, but that's a problem for another day...)
---
 tests/cp.test   |  7 +++++++
 toys/posix/cp.c | 31 +++++++++++++++++++------------
2 files changed, 26 insertions(+), 12 deletions(-)
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