OpenTopped moving fire customization

[Coronia]

• Whether or not a passenger's weapon can fire out from an OpenTopped=yes transport will now respect the weapon's FireWhileMoving setting.
• OpenTopped/OpenTransport.FireWhileMoving can be used to customize whether or not passengers can fire out when the transport is moving, for transport and passenger respectively. Both of them and the weapon's FireWhileMoving toggle need to be set to true to allow firing out when moving.

In rulesmd.ini:

[General]
OpenTopped.FireWhileMoving=true                   ; boolean
OpenTransport.FireWhileMoving=true                ; boolean

[SOMETECHNO]                                      ; TechnoType, transport with OpenTopped=yes
OpenTopped.FireWhileMoving=                       ; boolean, defaults to [General] -> OpenTopped.FireWhileMoving

[SOMETECHNO]                                      ; TechnoType, passenger
OpenTransport.FireWhileMoving=                    ; boolean, defaults to [General] -> OpenTransport.FireWhileMoving

[github-actions]

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[Starkku]

This technically works little bit different from actual OpportunityFire which contrary to its name actually affects target scanning not firing. Whether or not the distinction is important I am uncertain about, though.

It might be more sensible to use name like AllowFireWhileMoving or whatever since that one explicitly affects firing and is more similar to this in concept. Vanilla code FireWhileMoving also returns FireError::MOVING instead of FireError::ILLEGAL like you are currently doing but I am unsure if the OpenTopped context changes requirements here.