Add tasks for all the new languages

Task/Set/Lasso/set.lasso

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+// Extend set type
+define set->issubsetof(p::set) => .intersection(#p)->size == .size
+define set->oncompare(p::set) => .intersection(#p)->size - .size
+
+//	Set creation
+local(set1) = set('j','k','l','m','n')
+local(set2) = set('m','n','o','p','q')
+
+//Test m ∈ S -- "m is an element in set S"
+#set1 >> 'm'
+
+// A ∪ B -- union; a set of all elements either in set A or in set B.
+#set1->union(#set2)
+
+//A ∩ B -- intersection; a set of all elements in both set A and set B.
+#set1->intersection(#set2)
+
+//A ∖ B -- difference; a set of all elements in set A, except those in set B.
+#set1->difference(#set2)
+
+//A ⊆ B -- subset; true if every element in set A is also in set B.
+#set1->issubsetof(#set2)
+
+//A = B -- equality; true if every element of set A is in set B and vice-versa.
+#set1 == #set2