.Parenthesis, #if, "/*" comment and XML tag pair search

      C has 3 parenthesis notation (,[ and {.
      It is hard to search pair in deep nest.
      Alt+"." support it, Alt+"," search except excluded line.
      To ignore comment line, exclude those lines and use "Alt+,".
      This function support other pairing of <,> and /*,*/.
      The corresponding of same nest level of #if/#ifdef/#ifndef/#else
      /#endif/#elif is also searched.
      Move cursor on the parenthesis,# etc., then hit key.

      XML tag pair search
        .Default shortcut key is Alt+"/"
        .Use shortcut key on "<" or ">"
        .Comment portion(from "<!--" to "-->") is ignored
         and recognize nested tag.
         It is convenient to correct html automation tool generated.