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libtextstyle: Support the NO_COLOR environment variable.
It follows the specification at https://no-color.org/. The support is in the example programs, not in the function styled_ostream_create, so that it can be overridden through the command-line option --color=always. We only test whether the environment variable is set, not whether its value is non-empty. POSIX-specified environment variables are treated like unset when their value is empty; this is because in the old days it was not possible to unset an environment variable. But nowadays: - all shells support the 'unset' built-in, - all platforms that have the setenv() function also have the unsetenv() function, and - the 'env' program from GNU coreutils supports --unset=VARIABLE to unset a variable. This makes it possible to unset an environment variable that is set by the parent process. * libtextstyle/adhoc-tests/hello.c (main): Do not emit styling when the environment variable NO_COLOR is set. * libtextstyle/examples/color-filter/filter.c (main): Likewise. * libtextstyle/examples/color-hello/hello.c (main): Likewise. * gettext-tools/src/write-catalog.c (msgdomain_list_print): Likewise. * libtextstyle/doc/libtextstyle.texi (The NO_COLOR variable): New section. * libtextstyle/NEWS: Mention it.
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