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text property into account when doing SYNTAX (c).
(ST_COMMENT_STYLE, ST_STRING_STYLE): New codes to denote
delimiters for new types of strings and comments.
(Vparse_sexp_lookup_properties): New variable.
(struct lisp_parse_state): Comment updated.
(gl_state): New global variable.
(update_syntax_table): New function.
(char_quoted): Move earlier, update gl_state when needed.
(find_defun_start): Update gl_state when needed.
(back_comment): New function.
(Scomment_fence, Sstring_fence): New delimeter char classes
denoted by `!' and `|'.
(Fchar_syntax, Fmatching_paren): Update gl_state to whole-bufferstate.
(scan_words): update gl_state when needed.
(Fskip_chars_forward): Move from search.c.
(Fskip_chars_backward): Move from search.c.
(Fskip_syntax_forward): Move from search.c.
(Fskip_syntax_backward): Move from search.c.
(skip_chars): Move from search.c.
(Fforward_comment, scan_lists): Update gl_state when needed.
Handle Scomment_fence, Sstring_fence.
(Fbackward_prefix_chars) Update gl_state when needed.
(scan_sexps_forward): Update gl_state when needed.
Handle Scomment_fence, Sstring_fence.  If comment_stop==-1, stop at start
or end of comment or string.
(Fparse-partial-sexp): Doc fix.
(syms_of_syntax): Move initialization of skip* from search.c.