Created Unassigned: All properties (A, R, G, B) in GraphvizColor class gets color from a field [25569]

Code from GraphvizColor.cs:
```
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; } }
```
change it to:

```
public byte A { get { return this.a; } }
public byte R { get { return this.r; } }
public byte G { get { return this.g; } }
public byte B { get { return this.b; } }
```