add // clinch require begin\end statement processor

[Karpich Dmitry]

To dramatically speed up compilation time I'l to plan add 'chittng' statement for 'require' searching processor.
The each file will be watched (with RegExp) for string (strictly!!! - comment at start of string)
// clinch require begin
and only content till
// clinch require end
will be parsed to find out 'require' statiment in it.

If statement not be founded - all file will be parsed, as it worked now.

Oh! also this pair may be used on standalone files to suppress parsing process.

Its seems reasonable use one statement pair only, but may be someone have another idea?