.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.