重构背景系统（每个背景使用独立文件），全局变量名整理

parts/scenes/setting_skin.lua

@@ -4,21 +4,22 @@ local sin=math.sin
 
 function Pnt.setting_skin()
 	gc.setColor(1,1,1)
+	local texture=SKIN.curText
 	for N=1,7 do
 		local face=SETTING.face[N]
-		local B=blocks[N][face]
+		local B=BLOCKS[N][face]
 		local x,y=-55+140*N-spinCenters[N][face][2]*30,355+spinCenters[N][face][1]*30
 		local col=#B[1]
 		for i=1,#B do for j=1,col do
 			if B[i][j]then
-				gc.draw(blockSkin[SETTING.skin[N]],x+30*j,y-30*i)
+				gc.draw(texture[SETTING.skin[N]],x+30*j,y-30*i)
 			end
 		end end
 		gc.circle("fill",-10+140*N,340,sin(Timer()*10)+5)
 	end
-	gc.draw(blockSkin[17],930,610,nil,2)
+	gc.draw(texture[17],930,610,nil,2)
 	for i=1,5 do
-		gc.draw(blockSkin[19+i],570+60*i,610,nil,2)
+		gc.draw(texture[19+i],570+60*i,610,nil,2)
 	end
 end