Initial commit. Allow wanted fontification of open string in any mode.

The wanted fontification is for the string face to end at the first unescaped
newline.  This is achieved by a new syntax flag `s' on NL, which means
"terminate any open string".

src/syntax.c (SYNTAX_FLAGS_CLOSE_STRING, back_maybe_string): New functions.
(Fstring_to_syntax, Finternal_describe_syntax_value, scan_lists)
(scan_sexps_forward): Adapt to handle the `s' flag.

lisp/font-lock.el (font-lock-warn-open-string): New defcustom.
(font-lock-fontify-syntactically-region): Enhance to fontify " with

lisp/progmodes/sh-script.el (sh-mode-syntax-table): Add flag `s' to syntax
entry for \n.
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