Add tasks for all the new languages

Task/Variables/Lingo/variables-1.lingo

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+x = 23
+y = "Hello world!"
+z = TRUE -- same effect as z = 1

Task/Variables/Lingo/variables-2.lingo

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+on foo
+  put x
+end

Task/Variables/Lingo/variables-3.lingo

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+put value("x")
+-- <Void> -- means: undefined

Task/Variables/Lingo/variables-4.lingo

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+on foo
+  x = VOID
+  put x
+end

Task/Variables/Lingo/variables-5.lingo

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+global x
+on foo
+  put x
+end

Task/Variables/Lingo/variables-6.lingo

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+on foo
+  global x
+  put x
+end

Task/Variables/Lingo/variables-7.lingo

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+_global.x = 23

Task/Variables/Lingo/variables-8.lingo

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+put _global.x