Fix bug #16043 with crashes when displaying new bidi control characters.
src/bidi.c (bidi_get_type, bidi_get_category): Handle the isolate directional control characters. Update type and category determination according to the UBA from Unicode v6.3. (bidi_category_t): New category EXPLICIT_FORMATTING. src/dispextern.h (bidi_type_t): Update to include new bidirectional properties introduced with Unicode v6.3. admin/unidata/unidata-gen.el (unidata-prop-alist): Update bidi-class to include the new isolate-related classes introduced with Unicode v6.3. (unidata-encode-val): Accept an additional optional argument, a warning message to emit when UnicodeData.txt defines bidi-class values that are not in unidata-prop-alist. Add a comment explaining what should maintainers do if/when such a warning ever appears. (unidata-gen-table): Call unidata-encode-val with 3rd arg non-nil when generating uni-bidi.el.
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