ForceAbortCurrentInfil command

[Xymanek]

Sometimes the game crashes on loading into a mission and these crashes are not always resolvable. If this happens on an infil mission, the campaign is effected deadlocked (unless a previous save exists), as the player must launch the mission but cannot load into it.

Solution: make a command that will abort the current infil (eg. the one the player is currently looking at). Considerations:

• Unstaffing soldiers
• Properly closing mission blades without any side effects
• Geoscape refresh
• Chain/activity interaction (existing OnFail assume that it's called from post-mission)
• Probably more

[Xymanek]

Chain/activity interaction (existing OnFail assume that it's called from post-mission)

I just realized that there is currently some logic to handle aborting infils pre-100%, so we could hook into there probably