Make public void methods of Envelope2D return "this" for fluid programming

[mraad]

val envp = new Envelope2D(....) envp.move(dx,dy).scale(0.3).reaspect(ax,ay).centerAt(cx,cy)

[stolstov]

@climbage @randallwhitman Yes/no?

[climbage]

I don't have a strong opinion either way.

[stolstov]

I like chaining and use it in C++. However, in Java the method signature does not tell what the method does - creates a new object or returns this. So I am more in favor of leaving it as is.

[randallwhitman]

No strong opinion from me either.

When using Scala, can achieve the sample desired syntax via implicits to complement existing library.

[mraad]

I highly advocate to return this rather than void