Many more Rubocop-inspired code improvements

Data/Scripts/004_Game classes/008_Game_Event.rb

@@ -168,11 +168,12 @@ class Game_Event < Game_Character
   end
 
   def check_event_trigger_auto
-    if @trigger == 2      # Event touch
+    case @trigger
+    when 2   # Event touch
       if at_coordinate?($game_player.x, $game_player.y)
         start if !jumping? && over_trigger?
       end
-    elsif @trigger == 3   # Autorun
+    when 3   # Autorun
       start
     end
   end