Add tasks for all the new languages

Task/Generic-swap/Sidef/generic-swap-1.sidef

@@ -0,0 +1,5 @@
+func swap(Ref a, Ref b) {
+    var tmp = *a;
+    *a = *b;
+    *b = tmp;
+}

Task/Generic-swap/Sidef/generic-swap-2.sidef

@@ -0,0 +1,3 @@
+func swap(Ref a, Ref b) {
+    (*a, *b) = (*b, *a);
+}

Task/Generic-swap/Sidef/generic-swap-3.sidef

@@ -0,0 +1,3 @@
+func swap(Ref a, Ref b) {
+    [*a, *b] » (b, a);
+}

Task/Generic-swap/Sidef/generic-swap-4.sidef

@@ -0,0 +1,2 @@
+var (x, y) = (1, 2);
+swap(\x, \y);