Add a property to check "waiting on red signal"

[DorpsGek]

George opened the ticket and wrote:

R26555

There are props
vehicle_is_hidden [0 | 1]
vehicle_is_stopped [0 | 1]
vehicle_is_crashed [0 | 1]
vehicle_is_broken [0 | 1]

We need one more prop - vehicle_is_waiting_on_red_signal
Without it we can't test, it is moving very slow or stands on signal

Reported version: trunk
Operating system: All

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This issue was imported from FlySpray: https://bugs.openttd.org/task/6007

[DorpsGek]

frosch closed the ticket.

Reason for closing: Duplicate

of #5877

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This comment was imported from FlySpray: https://bugs.openttd.org/task/6007