Resolved many Rubocop warnings

Data/Scripts/004_Sprites/007_Spriteset_Global.rb

@@ -1,13 +1,13 @@
 class Spriteset_Global
   attr_reader :playersprite
-  @@viewport2 = Viewport.new(0,0,Graphics.width,Graphics.height)
+  @@viewport2 = Viewport.new(0, 0, Graphics.width, Graphics.height)
   @@viewport2.z = 200
 
   def initialize
-    @playersprite = Sprite_Character.new(Spriteset_Map.viewport,$game_player)
+    @playersprite = Sprite_Character.new(Spriteset_Map.viewport, $game_player)
     @picture_sprites = []
     for i in 1..100
-      @picture_sprites.push(Sprite_Picture.new(@@viewport2,$game_screen.pictures[i]))
+      @picture_sprites.push(Sprite_Picture.new(@@viewport2, $game_screen.pictures[i]))
     end
     @timer_sprite = Sprite_Timer.new
     update
@@ -15,9 +15,7 @@ class Spriteset_Global
 
   def dispose
     @playersprite.dispose
-    for sprite in @picture_sprites
-      sprite.dispose
-    end
+    @picture_sprites.each { |sprite| sprite.dispose }
     @timer_sprite.dispose
     @playersprite = nil
     @picture_sprites.clear
@@ -26,9 +24,7 @@ class Spriteset_Global
 
   def update
     @playersprite.update
-    for sprite in @picture_sprites
-      sprite.update
-    end
+    @picture_sprites.each { |sprite| sprite.update }
     @timer_sprite.update
   end
 end

Data/Scripts/004_Sprites/010_ParticleEngine.rb

@@ -117,7 +117,8 @@ end
 
 
 class ParticleSprite
-  attr_accessor :x, :y, :z, :ox, :oy, :opacity, :bitmap, :blend_type
+  attr_accessor :x, :y, :z, :ox, :oy, :opacity, :blend_type
+  attr_reader :bitmap
 
   def initialize(viewport)
     @viewport   = viewport