forgot some things, display dumb user warning on MapControllers.

Themes/default/BGAnimations/ScreenGameplay go/default.lua

@@ -0,0 +1,4 @@
+return LoadActor("go") .. {
+	InitCommand=cmd(Center;draworder,105);
+	StartTransitioningCommand=cmd(zoom,1.3;diffusealpha,0;bounceend,0.25;zoom,1;diffusealpha,1;linear,0.15;glow,BoostColor(Color("Blue"),1.75);decelerate,0.3;glow,1,1,1,0;sleep,1-0.45;linear,0.25;diffusealpha,0;);
+};

Themes/default/BGAnimations/ScreenGameplay underlay/danger.lua

@@ -0,0 +1,27 @@
+local players = GAMESTATE:GetHumanPlayers()
+
+local t = Def.ActorFrame {};
+
+for pn=1,#players do
+	t[#t+1] = Def.ActorFrame {
+		InitCommand=function(self)
+			self:y(SCREEN_CENTER_Y)
+			self:x(
+				THEME:GetMetric(
+					Var "LoadingScreen",
+					"Player" .. ToEnumShortString(players[pn]) .. ToEnumShortString(GAMESTATE:GetCurrentStyle():GetStyleType()) .. "X"
+				)
+			)
+		end,
+		Def.Quad {
+			InitCommand=function(self)
+				(cmd('fadeleft,0.1;faderight,0.1;zoomtoheight,SCREEN_HEIGHT'))(self)
+				self:zoomtowidth(
+					Center1Player() and SCREEN_WIDTH-32 or SCREEN_CENTER_X-16
+				)
+			end
+		};
+	};
+end
+
+return t