Add some hidden modes + misc changes (#640)

* Added secret_grade and sprint123 to map and added some icons

* Add master_g to map

* add classic_u and master_instinct and misc changes

* added big modes

* Fix some bugs on master_instinct

* fix bugs on big mode

* Simplified Grade Display

parts/modes/big_n.lua

@@ -7,16 +7,16 @@ return{
         eventSet='big_n',
         bg='bg2',bgm='push',
     },
-    score=function(P)return{math.min(P.modeData.maxCombo,100),P.stat.time}end,
-    scoreDisp=function(D)return D[1].." Combo   "..STRING.time(D[2])end,
+    score=function(P)return{P.stat.row,P.stat.time}end,
+    scoreDisp=function(D)return D[1].." Lines   "..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 L=P.stat.row
         if L>=200 then
             local T=P.stat.time
             return
-            T<=180 and 5 or
-            T<=300 and 4 or
+            T<=120 and 5 or
+            T<=180 and 4 or
             3
         else
             return