Add HTTP Swagger client generator (#250)

WoofWare.Myriad.Plugins/List.fs

@@ -12,3 +12,12 @@ module private List =
             )
 
         List.rev xs, List.rev ys
+
+    let allSome<'a> (l : 'a option list) : 'a list option =
+        let rec go acc (l : 'a option list) =
+            match l with
+            | [] -> Some (List.rev acc)
+            | None :: _ -> None
+            | Some head :: tail -> go (head :: acc) tail
+
+        go [] l