整理代码，新增string扩展模块，把一些小模块合并进string和table扩展模块中

parts/modes/master_final.lua

@@ -66,7 +66,7 @@ return{
 		gc.rectangle("fill",25,375,90,4)
 	end,
 	score=function(P)return{P.modeData.pt,P.stat.time}end,
-	scoreDisp=function(D)return D[1].."P   "..TIMESTR(D[2])end,
+	scoreDisp=function(D)return D[1].."P   "..STRING.time(D[2])end,
 	comp=function(a,b)return a[1]>b[1]or a[1]==b[1]and a[2]<b[2]end,
 	getRank=function(P)
 		local S=P.modeData.pt