Revert "6.0 release"

This reverts commit a0aea8f030.

Data/Scripts/050_AddOns/Spped Up.rb

@@ -55,9 +55,7 @@ module Graphics
       $GameSpeed = 0 if $GameSpeed >= SPEEDUP_STAGES.size
     end
     $frame += 1
-    speedStage = SPEEDUP_STAGES[$GameSpeed]
-    speedStage=5 if $DEBUG && Input.press?(Input::SHIFT)
-    return unless $frame % speedStage == 0
+    return unless $frame % SPEEDUP_STAGES[$GameSpeed] == 0
     fast_forward_update
     $frame = 0
   end