Add tasks for all the new languages

Task/First-class-functions/Lingo/first-class-functions-1.lingo

@@ -0,0 +1,12 @@
+-- sin, cos and sqrt are built-in, square, asin and acos are user-defined
+A = [#sin, #cos, #square]
+B = [#asin, #acos, #sqrt]
+
+testValue = 0.5
+
+repeat with i = 1 to 3
+  -- for implementation details of compose() see https://www.rosettacode.org/wiki/Function_composition#Lingo
+  f = compose(A[i], B[i])
+  res = call(f, _movie, testValue)
+  put res = testValue
+end repeat

Task/First-class-functions/Lingo/first-class-functions-2.lingo

@@ -0,0 +1,13 @@
+on square (x)
+  return x*x
+end
+
+on asin (x)
+  res = atan(sqrt(x*x/(1-x*x)))
+  if x<0 then res = -res
+  return res
+end
+
+on acos (x)
+  return PI/2 - asin(x)
+end