Removed broken map change approach, fixed serious bugs#24

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Tabbernaut wants to merge 4 commits intoStabbath:masterfrom

Tabbernaut:master

Commits on Dec 3, 2020

Removed funky map switch to fix coop finale mission fail handling
czim
committed

Commits on Dec 7, 2020

Added randomcoop mapset configs for 3 and 5 map campaigns
czim
committed

Commits on Dec 12, 2020