Ability to manipulate windows/doors directly in model

[Christiaan 647]

We'd like to be able to manipulate windows directly in the model, similarly to how we already can with the Curtain Wall Tool, including:

• Resize window/door widths, heights and sill/head position via a set of selection handles
• Move transom, sash and mullion positions

[zoomer 800]

Of course we want !