Add tasks for all the new languages

Task/Generic-swap/Gri/generic-swap-1.gri

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+`Swap Vars &.a. &.b.'
+{
+    new .temp.
+    .temp. = \.word2.
+    \.word2. = \.word3.
+    \.word3. = .temp.
+    delete .temp.
+}
+
+.foo. = 123
+.bar. = 456
+Swap Vars &.foo. &.bar.
+
+show .foo. " " .bar.
+# prints "456 123"

Task/Generic-swap/Gri/generic-swap-2.gri

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+`Swap Syns &\a &\b'
+{
+    new \temp
+    \temp = "\.word2."
+    \.word2. = "\.word3."
+    \.word3. = "\temp"
+    delete \temp
+}
+
+\quux = "one"
+\xyzzy = "two"
+Swap Syns &\quux &\xyzzy
+
+show "\quux \xyzzy"
+# prints "two one"