(find_char_unquote): Make second arg a string of stop chars instead of a

(find_char_unquote): Make second arg a string of stop chars instead of a
single stop char.  Stop when any char in the string is hit.
All callers changed.
(find_semicolon): Pass stop chars "#;" to one find_char_unquote call,
instead of using two calls.  If the match is not a ; but a #, return zero.