Make some modifier stuff global and add saving

eid_api.lua

@@ -1335,3 +1335,50 @@ function EID:getLanguage()
 	end
 	return lang
 end
+
+-- Afterbirth+ modifiers
+local collectiblesToCheck = { CollectibleType.COLLECTIBLE_VOID, }
+local maxSlot = 1
+-- Repentance modifiers
+if REPENTANCE then
+	maxSlot = 3
+	--include the AB+ collectiblesToCheck in this table!
+	collectiblesToCheck = { CollectibleType.COLLECTIBLE_VOID,
+		CollectibleType.COLLECTIBLE_BINGE_EATER, CollectibleType.COLLECTIBLE_BOOK_OF_VIRTUES, CollectibleType.COLLECTIBLE_SPINDOWN_DICE, 
+		CollectibleType.COLLECTIBLE_TAROT_CLOTH, CollectibleType.COLLECTIBLE_MOMS_BOX, 59, --Birthright Belial
+		CollectibleType.COLLECTIBLE_BLANK_CARD, CollectibleType.COLLECTIBLE_CLEAR_RUNE, CollectibleType.COLLECTIBLE_PLACEBO, 
+		CollectibleType.COLLECTIBLE_FALSE_PHD, CollectibleType.COLLECTIBLE_ABYSS, CollectibleType.COLLECTIBLE_FLIP,
+	}
+end
+local blackRuneOwned = false
+local lastCheck = 0
+function EID:CheckPlayersCollectibles()
+	-- recheck the players' owned collectibles periodically, not every frame
+	if EID.GameUpdateCount >= lastCheck + 15 then
+		lastCheck = EID.GameUpdateCount
+		local numPlayers = game:GetNumPlayers()
+		local players = {}; for i = 0, numPlayers - 1 do players[i] = Isaac.GetPlayer(i) end
+		for _,v in ipairs(collectiblesToCheck) do
+			EID.collectiblesOwned[v] = false
+			for i = 0, numPlayers - 1 do
+				if players[i]:HasCollectible(v) then
+					EID.collectiblesOwned[v] = i
+					break
+				end
+			end
+		end
+		blackRuneOwned = false
+		for i = 0, numPlayers - 1 do
+			for j = 0, maxSlot do
+				if players[i]:GetCard(j) == Card.RUNE_BLACK then
+					blackRuneOwned = i
+					break
+				end
+			end
+		end
+	end
+end
+
+function EID:AddToCollectiblesToCheckList(itemID)
+	table.insert(collectiblesToCheck, itemID)
+end