CCNWorkspaceController: refactor -updateCursor.
CCNWorkspaceController: refactor -updateCursor.

1. Use setScaleCursor block.
2. Use nodeRotation in world coordinates to choose cursor to fit better.
3. Change priority in all if statements - we
need non-nil nodeAtCursor to get cursor rotation.

psineur/Coconade,alexeylang/Coconade