Revise tools scripts to be python3 compatible #4856
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We introduce setup_stdio function to setup stdout/stderr properly.
For python <-> python pipe, we always use 'utf8'/'ignore' encoding for not lost
characters.
For tty <-> python, we using native encoding with xmlcharrefreplace to encode, to
preserve maximal information.
For python <-> native program, we use naive encoding with 'ignore' to not cause error
Fixes #4854
JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com