Rename template.go to format.go, a table's tokens to cellTemplates, drawAt.alt to pinned and ftoken's brace-body kind to 't', and drop the done item

graph.go

@@ -63,7 +63,7 @@ func contained(n node) []namedNode {
 	case *table:
 		return append([]namedNode{{node: n.format}}, named(n.fields)...)
 	case *column:
-		if len(n.t.tokens) == 0 {
+		if len(n.t.cellTemplates) == 0 {
 			return nil
 		}
 		var out []namedNode