清除自定义游戏的老版本残留无用代码，移除bagLen变量，直接用bagLine保存包间隔块数

parts/modes/custom_clear.lua

@@ -31,10 +31,10 @@ local function checkClear(P)
 		D.finished=D.finished+1
 		if FIELD[D.finished+1]then
 			P.waiting=26
-			for _=#P.field,1,-1 do
-				FREEROW.discard(P.field[_])
-				FREEROW.discard(P.visTime[_])
-				P.field[_],P.visTime[_]=nil
+			for i=#P.field,1,-1 do
+				FREEROW.discard(P.field[i])
+				FREEROW.discard(P.visTime[i])
+				P.field[i],P.visTime[i]=nil
 			end
 			setField(P,D.finished+1)
 			SYSFX.newShade(1.4,P.absFieldX,P.absFieldY,300*P.size,610*P.size,.6,.8,.6)
@@ -50,19 +50,17 @@ return{
 	load=function()
 		applyCustomGame()
 
-		local ENV=GAME.modeEnv
-		ENV.dropPiece=PLY.check_lineReach
 		for y=1,20 do
 			if notAir(FIELD[1][y])then
 				--Switch clear sprint mode on
-				ENV.dropPiece=checkClear
+				GAME.modeEnv.dropPiece=checkClear
 				break
 			end
 		end
 
 		PLY.newPlayer(1)
-		local AItype=ENV.opponent:sub(1,2)
-		local AIlevel=tonumber(ENV.opponent:sub(-1))
+		local AItype=GAME.modeEnv.opponent:sub(1,2)
+		local AIlevel=tonumber(GAME.modeEnv.opponent:sub(-1))
 		if AItype=='9S'then
 			PLY.newAIPlayer(2,AIBUILDER('9S',2*AIlevel))
 		elseif AItype=='CC'then

parts/modes/custom_puzzle.lua

@@ -39,10 +39,9 @@ return{
 	},
 	load=function()
 		applyCustomGame()
+		local AItype=GAME.modeEnv.opponent:sub(1,2)
+		local AIlevel=tonumber(GAME.modeEnv.opponent:sub(-1))
 		PLY.newPlayer(1)
-		local ENV=GAME.modeEnv
-		local AItype=ENV.opponent:sub(1,2)
-		local AIlevel=tonumber(ENV.opponent:sub(-1))
 		if AItype=='9S'then
 			PLY.newAIPlayer(2,AIBUILDER('9S',2*AIlevel))
 		elseif AItype=='CC'then