Support CLR Attributes in deftype

[nasser]

(deftype ^{ObsoleteAttribute "abc"
           FileDialogPermissionAttribute SecurityAction/Demand
           FileIOPermissionAttribute #{SecurityAction/Demand {:__args [SecurityAction/Deny] :Read "def"}}}
 Bar [^int a
      ^{:tag int
        NonSerializedAttribute {}
        ObsoleteAttribute "abc"}
      b]

  Foo (^{ObsoleteAttribute "abc"
         FileDialogPermissionAttribute SecurityAction/Demand
         FileIOPermissionAttribute #{SecurityAction/Demand {:__args [SecurityAction/Deny] :Read "def"}}}
        foo [this] 42))