[nem-en] Debug support

[vc]

> > And I can't set breakpoint on begin match (on match keyword).
> > The C# compiler add 'not' in begin and end all blacks (and some
> statements)
> > which allow set breakpoint.
> 
> It works better now. I had to put emission of Nops in a few places,
> which could in general be omitted, 

Hm... All the same I can't set breakpoint on match. 

> > Another example is expression:
> > def x = SomeMethod();
> 
> It works almost like in C# now.

It's good! :)
But will be nice if breakpoint location entirely include line location. Now
breakpoint location is invisible (have one pixel size). 

 
> ... maybe next time :(

Wait for next time. :)