Allies should not be removed until "The Trial / Boxing the Line" is resolved

[drnlm]

This was reported on boardgamegeek - https://boardgamegeek.com/article/20340887#20340887 - but no one seems to have filed an issue here.

Discarding allies is the first step of resolving "The Trail / Boxing the Line" (Exodus rulebook, page 20), so they should not be discarded when crossroads cards are dealt. This is potentially important when locations are damaged or players executed during crossroads, since that could allow Cylon players to dump more trauma.

AFAICT, this requires moving the discarding allies loop from IonNeb.DealCrossroads to IonNeb.ButtonResolveCrossroads It will also require changing IonNeb.UpdateTTTargetList to append "Crossroads card" to the list of targets, rather than replacing the entire list, so trauma can still be assigned to any allies that appear.

This also requires changing the logic for when to stop drawing allies and trauma tokens. I don't have a better idea than adding an extra flag somewhere to the Ionian Nebula tab that is checked instead of the current distance tab, but