GntNode

struct GntNode {
  GntWidget* me;
  WINDOW* window;
  int scroll;
  PANEL* panel;
  GntWS* ws;
}

A node in the window management tree.

`me`	The widget handled by this node.
`window`	The ncurses window that backs this node.
`scroll`	The scroll position of the node.
`panel`	The ncurses panel that backs this node.
`ws`	The workspace of this node.