Add tasks for all the new languages

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

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+-- 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