[canvas.top] issue in abstractions

[60-hz]

When [canvas.top] is inside abstraction, the width height, or x y positions return 0. The objet behave normally in a subpatch.

For those type of objets that get informations from different canvas level (like [system.cursor] or [canvas.dir]) it might be interesting to give the level of the canvas as argument to get information from, rather than making different objects interface [.current .top...).

[uliss]

added span>@</spanabs property for controlling behavior inside abstractions