Add code to initialize bidi iterator for displaying strings.
For now, ifdef'ed away. Some more testing. src/bidi.c (bidi_level_of_next_char): Allow the sentinel "position" to pass the test for valid cached positions. src/xdisp.c (init_iterator): Call bidi_init_it only of a valid buffer position was specified. Initialize paragraph_embedding to L2R. (reseat_to_string): Initialize the bidi iterator (for now ifdef'ed out). (display_string): If we need to ignore text properties of LISP_STRING, set IT->stop_charpos to IT->end_charpos. (The original value of -1 will not work with bidi.) src/dispextern.h (struct bidi_string_data): New member lstring.
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