SVG engine

[yanjustino]

Well, Plantuml is cool but...

I've thinking create a new C4 Engine to replace plantuml. My ideia is use SVG over html. For this, we should change the way that Structure class parse contents in ToString() method. Probably we will need of strategy pattern to switch between PLANTUML and SVG results.

[jtreher]

I think this is an interesting idea. The most challenge aspect seems to be how you'd auto-balance the diagram. PlantUML doesn't always do a great job with this, but at least it avoids too many overlapping lines most of the time.