Messages: Remove the DataIE place holder

Right now we always want to decode everything. If we end up
with performance issues we might re-introduce this class.

Messages.st

@@ -19,37 +19,6 @@ Object subclass: IEBase [
     ]
 ]
 
-Object subclass: DataIE [
-    | data |
-
-    <category: 'osmo-messages'>
-    DataIE class >> initWith: aData [
-        ^ self new
-            data: aData;
-            yourself
-    ]
-
-    type [
-        ^ data at: 1
-    ]
-
-    type: aType [
-        data at: 1 put: aType.
-    ]
-
-    data [
-        ^ data
-    ]
-
-    data: aData [
-        data := aData.
-    ]
-
-    writeOn: aMsg [
-        aMsg putByteArray: data.
-    ]
-]
-
 Object subclass: IEMessage [
     <category: 'osmo-messages'>
     | ies type |