Add tasks for all the new languages

Task/Visualize-a-tree/Lingo/visualize-a-tree-1.lingo

@@ -0,0 +1,25 @@
+-- parent script "TreeItem"
+-- (minimal implementation with direct property access)
+
+property name
+property children
+
+on new (me, itemName)
+  me.name = itemName
+  me.children = []
+  return me
+end
+
+on addChild (me, child)
+  me.children.add(child)
+end
+
+-- print a tree
+on printTree (me, treeItem, indent)
+  if voidP(treeItem) then treeItem = me
+  if voidP(indent) then indent = ""
+  put indent&treeItem.name
+  repeat with c in treeItem.children
+    me.printTree(c, indent&"  ")
+  end repeat
+end

Task/Visualize-a-tree/Lingo/visualize-a-tree-2.lingo

@@ -0,0 +1,17 @@
+-- create a tree
+root = script("TreeItem").new("root")
+a = script("TreeItem").new("a")
+root.addChild(a)
+b = script("TreeItem").new("b")
+root.addChild(b)
+a1 = script("TreeItem").new("a1")
+a.addChild(a1)
+a11 = script("TreeItem").new("a11")
+a1.addChild(a11)
+a12 = script("TreeItem").new("a12")
+a1.addChild(a12)
+b1 = script("TreeItem").new("b1")
+b.addChild(b1)
+
+-- print the tree
+root.printTree()