玩家的随机数生成器独立为四个，尝试避免联网对战时不同步错误，整理代码

parts/modes/pctrain_n.lua

@@ -13,7 +13,7 @@ local function task_PC(P)
 		D.counter=D.counter+1
 		if D.counter==26 then
 			local base=PCbase[D.type]
-			P:pushLineList(base[P:RND(#base)],D.symmetry)
+			P:pushLineList(base[P.holeRND:random(#base)],D.symmetry)
 		end
 		YIELD()
 	end
@@ -26,8 +26,8 @@ local function check(P)
 		end
 	else
 		local type=PCtype[P.stat.pc+1]or 3
-		local L=PClist[type][P:RND(#PClist[type])]
-		local symmetry=P:RND()>.5
+		local L=PClist[type][P.holeRND:random(#PClist[type])]
+		local symmetry=P.holeRND:random()>.5
 		P.modeData.type=type
 		P.modeData.symmetry=symmetry
 		P:pushNextList(L,symmetry)