Add ability to specify the radial for a hold

[oobayly]

As the title suggests, this would allow the player to specify the radial (inbound heading) that the aircraft should use when holding.

The radial option is purely optional, and defaults to the current behaviour if no radial is provided.

WZZ36EX hold abbot 265

Readback: WZZ36EX, hold east of ABBOT on the 265 radial, right turns, 1min legs

[erikquinn]

The heading should actually be defined by the radial FROM the holding fix, not the inbound heading, when the user inputs it. For example, the phraseology would be:
AAL123, cleared to JAAWY via direct, hold south of JAAWY on the 190 radial, right turns, 10 mile legs, expect further clearance 1305. This would result in him holding to the south of the fix, with an inbound heading of 010.

[erikquinn]

So your example command actually should yield a hold WEST of ABBOT, with an inbound heading of 085.

[oobayly]

Thanks. As inboundHeading was used internally, I assumed (and we all know what they're related to) that that was how the phraseology was defined.

[erikquinn]

Yep, it uses the inbound heading because that's easier for maths. You can just accept the radial from the user and add pi to store the inhoundHeading (and radians_normalize()).

[oobayly]

Yup, done exactly that and updated the variable/const names to reflect that.