Pull out general changes from ArgParser PR (#217)

WoofWare.Myriad.Plugins/SynExpr/SynAttributes.fs

@@ -0,0 +1,15 @@
+namespace WoofWare.Myriad.Plugins
+
+open Fantomas.FCS.Syntax
+open Fantomas.FCS.Text.Range
+
+[<RequireQualifiedAccess>]
+module internal SynAttributes =
+    let ofAttrs (attrs : SynAttribute list) : SynAttributes =
+        attrs
+        |> List.map (fun a ->
+            {
+                Attributes = [ a ]
+                Range = range0
+            }
+        )