[2.0] Allow tanks to be selected from map view in areas without radar coverage

[jmillikin]

When remote driving the tank, it's common to accidentally exit the remote drive mode (such as by pressing escape to save). If this happens while the tank is in an area with radar coverage then there's no problem, just find it again on the map and re-enable remote drive. But if the tank is outside radar coverage then it can't be selected, which means it can't be remote-controlled and it's now lost forever unless you want to send out another vehicle to its location and establish a radar outpost.

My suggestion is to allow selecting a tank even if the map view is in icon mode, such as when it's zoomed out or outside radar coverage. This is supported by trains, so I'm guessing (hoping) similar logic could be applied to other vehicle categories.