Add Packet_Type param to VOEvents

There is one parameter that we must add to our VOEvents for support of existing GCN VOEvent clients:

<Param name="Packet_Type" dataType="int" value="150">
    <Description>The Notice Type number is assigned/used within GCN, eg type=150 is an LVC_PRELIMINARY notice</Description>
</Param>

The allowed values are:

LVC_PRELIMINARY=150
LVC_INITIAL=151
LVC_UPDATE=152

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