[antlr-interest] ST visualizer GUI prototype

[Terence Parr]

well, that was easy. 5 or 6 hours cutting/pasting from web and I have  
an initial prototype ST viewer.  It shows tree of template evals on  
left, template eval stack on lower left, attributes to the right of  
that, output on top right, and template pattern on lower right.  As  
you click around templates, the various displays update.

Next I need to reverse it so you can click in output to find which  
template generated it.  Also, I am tracking what code sets attributes  
and creates St instances.  I'm going to patch that in so it can show  
you where in your code everything originated.

Uh, like, cool. 2 snapshots enclosed.  Ugly but functional at this  
point.

So easy, not sure if it's worth a serialization protocol to handle C#  
and Python...takes a day to build the GUI and it's easier playing with  
real ST objects in the native language.

Ter

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