[WISH] Add LibXmlRpc_OnSpeedBoost

[undef.de]

As we have LibXmlRpc_OnWayPoint, please add LibXmlRpc_OnSpeedBoost like this:

LibXmlRpc_OnSpeedBoost

• Data: An array with the login of the player crossing the turbo, the id of the turbo block and the gained speed boost.
• Example: ["Login", "#123456", "150"]
• Note: This callback is sent when a player crosses a turbo

Legend
150 = 150% boost on a Stadium 1-2-6 block.