Commented Issue: GraphvizEdge.ToDot() wrong graphviz properties [22051]

Mappings for FontGraphvizColor and StrokeGraphvizColor are wrong, so it is impossible to change edge stroke and font color.
 
Replacement:
fontGraphvizColor → fontcolor
GraphvizColor → color
 
Seems like URL property is also invalid (http://www.graphviz.org/doc/info/attrs.html).
Comments: ** Comment from web user: CSP **

And then there's:
```
public struct GraphvizColor : IEquatable<GraphvizColor>
{
private readonly byte a;
private readonly byte r;
private readonly byte g;
private readonly byte b;

public byte A
{
get
{
return this.a;
}
}

public byte R
{
get
{
return this.a;
}
}

public byte G
{
get
{
return this.a;
}
}

public byte B
{
get
{
return this.a;
}
}
...
```