[Toybox] [PATCH] echo/printf: expand test cases, fix \x corner cases.

[enh]

The behavior with "\xAV" (where the second hex digit is invalid) is
different from the behavior with "\xVA", and echo and printf differ from
each other.
---
 tests/echo.test     |  7 +++++++
 tests/printf.test   | 16 ++++++++++++++++
 toys/posix/echo.c   | 12 +++++++++---
 toys/posix/printf.c | 11 ++++-------
 4 files changed, 36 insertions(+), 10 deletions(-)
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