[Implemented] TOW Alert

[Seven]

I find it quite easy to see a Tow request pop up on the right under my InSim, I find it rather eye-catching to see something pop up where I know something shouldn't be. But then again, I use a locator after a Tow as it stays on, so a message in the middle of the screen providing name and location of the Tow would be useful, not a half bad idea.