* Handled via the MXPModule.cs located in OpenSim.Client.MXP namespace.
* Also implements MXPClientView and MXPPacketServer for IClientAPI compatibility.
* No changes were required to Core to implement this - the thing is self contained in OpenSim.Client.MXP.dll.
* Includes reference implementation of MXP as MXP.dll - this is under the Apache 2.0 license.
* Requires OpenSim.ini setting to enable. "[MXP] \n Enabled=true \n Port=1253"
* May break. Highly untested.