Customize several behavior of mission area guard

[TaranDahl]

Customize several behavior of mission area guard

• In vanilla, technos in area guard mission will use the focus as the center of targeting and stray.
  • Now you can change the center to itself by using AreaGuard.UseSelfAsCenter=true. (For stray, what is checked is the distance between the techno and the current target)
• In vanilla, technos in area guard mission will do targeting in an extended range (roughly 2 times of the guard range).
  • Now you can change the range to the guard range by using AreaGuard.TargetingInRange=true.
• In vanilla, technos in area guard mission will not stray unless it has no destination.
  • Now you can change the behavior by using AreaGuard.StrayIgnoreDestination=true.

In rulesmd.ini:

[General]
AreaGuard.UseSelfAsCenter=         ; boolean
AreaGuard.TargetingInRange=        ; boolean
AreaGuard.StrayIgnoreDestination=  ; boolean

In vanilla, if `GuardRange` is not set, then the guard range will be automatically deduced based on the weapon range.

[github-actions]

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[TaranDahl]

Bounty: 10 CNY for the 1st reviewer who gives valid review