Add old GMCP Enabled Script

This is the XML for my old GMCP Enabled script. It's technically more accurate that what is in discMapper currently, because it only runs when the `sysProtocolEnabled` event fires and the protocol is, in fact, GMCP. I'm just too tired ATM to mess with it.

```

<name>dsGMCPEnabled</name>
<packageName></packageName>
<script>function dsGMCPEnabled(_, protocol)
if protocol == "GMCP" then
map.echo(" - GMCP Enabled")
end
end

sysProtocolEnabled

```