maint: Update source file encodings to UTF-8 and fix character errors * scripts/help/doc.m, scripts/help/lookfor.m, scripts/help/private/__additional_help_message__.m, scripts/help/private/__strip_html_tags__.m, scripts/miscellaneous/tar.m, scripts/miscellaneous/untar.m, scripts/miscellaneous/unzip.m: Update file encoding to UTF-8. * etc/OLD-ChangeLogs/scripts-ChangeLog, scripts/geometry/inpolygon.m, scripts/help/__makeinfo__.m, scripts/help/doc_cache_create.m, scripts/help/get_first_help_sentence.m, scripts/help/help.m, scripts/help/print_usage.m, scripts/help/type.m, scripts/pkg/pkg.m: Restore correct characters in contributor names instead of UTF-8 replacement character.

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