Add tasks for all the new languages

Task/Stack/Lingo/stack.lingo

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+-- parent script "Stack"
+
+property _tos
+
+on push (me, data)
+  me._tos = [#data:data, #next:me._tos]
+end
+
+on pop (me)
+  if voidP(me._tos) then return VOID
+  data = me._tos.data
+  me._tos = me._tos.next
+  return data
+end
+
+on peek (me)
+  if voidP(me._tos) then return VOID
+  return me._tos.data
+end
+
+on empty (me)
+  return voidP(me.peek())
+end