Implemented scripted versions for ability target styles

[Xymanek]

Based on discord suggestion by @robojumper, only affects abilities that use a scripted style(s)

Demo: Xymanek@36c5b96

[0107.18] CreateAbilityStateFromTemplate: HoloTargeting state created default
[0107.18] CreateAbilityStateFromTemplate: ChainShot state created default
[0107.18] CreateAbilityStateFromTemplate: HailOfBullets state created custom
[0107.18] CreateAbilityStateFromTemplate: BulletShred state created default

[0115.41] Log: X2TacticalGameRuleset_0 TurnPhase_UnitActions: Check for Available Actions
[0115.41] GatherAbilityTargets: Entered script version for HailOfBullets
[0115.41] X2AbilityTarget_Scripted: GetPrimaryTargetOptions
[0115.41] X2AbilityTarget_Scripted: CheckFilteredPrimaryTargets
[0115.41] ScriptLog: XComTacticalInput.uc, Transition to/from State None detected. BeginState ActiveUnit_Moving from None

cc @Iridar (I did this to prove you wrong ), @pledbrook (I know LW2 needed this)

[Xymanek]

Needs tracking issue and docs, @Iridar?

[robojumper]

The addition of the _Scripted classes is unnecessarily complicated. We control all native classes, so creating a hardcoded list of native target styles is viable. This would make the solution more "plug-and-play" and would also allow people to subclass existing native target styles, potentially calling the super functions or patching existing target styles from foreign templates using the new-with-template syntax.

P.S.: I don't suppose there's a way to easily find out whether a class is native? THERE IS: #764

[Xymanek]

Currently waiting for #764 to be merged

[pledbrook]

#764 has been merged

[robojumper]

Closing in favor of #918.