add jukebox to default theme

Themes/default/BGAnimations/ScreenJukebox in.lua

@@ -0,0 +1,6 @@
+return Def.ActorFrame{
+	Def.Quad{
+		InitCommand=cmd(FullScreen;diffuse,color("0,0,0,1"));
+		OnCommand=cmd(decelerate,0.5;diffusealpha,0);
+	};
+};

Themes/default/BGAnimations/ScreenJukebox out.lua

@@ -0,0 +1,6 @@
+return Def.ActorFrame{
+	Def.Quad{
+		InitCommand=cmd(FullScreen;diffuse,color("0,0,0,0"));
+		OnCommand=cmd(accelerate,0.5;diffusealpha,1);
+	};
+};

Themes/default/metrics.ini

@@ -652,7 +652,7 @@ NetworkStatusOffCommand=linear,0.5;cropright,1
 #
 HelpY=SCREEN_BOTTOM-24
 #
-ChoiceNames="GameStart,Options,Edit,Exit"
+ChoiceNames="GameStart,Options,Edit,Jukebox,Exit"
 DefaultChoice="GameStart"
 
 [ScreenQuickSetupOverview]