Seleucid main menu background

This was SVN commit r18968.

binaries/data/mods/public/gui/pregame/backgrounds/seleucid.js

@@ -0,0 +1,18 @@
+g_BackgroundLayerData.push(
+	[
+		{
+			"offset": (time, width) => 0.05 * width * Math.cos(0.02 * time),
+			"sprite": "background-seleucid1_1",
+			"tiling": true,
+		},
+		{
+			"offset": (time, width) => 0.10 * width * Math.cos(0.04 * time),
+			"sprite": "background-seleucid1_2",
+			"tiling": true,
+		},
+		{
+			"offset": (time, width) => 0.17 * width * Math.cos(0.05 * time) + width/8,
+			"sprite": "background-seleucid1_3",
+			"tiling": false,
+		},
+	]);

binaries/data/mods/public/gui/pregame/backgrounds/seleucid.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<sprites>
+	<sprite name="background-seleucid1_1">
+		<image
+			texture="pregame/backgrounds/seleucid1_1.png"
+			fixed_h_aspect_ratio="2"
+			round_coordinates="false"
+		/>
+	</sprite>
+
+	<sprite name="background-seleucid1_2">
+		<image
+			texture="pregame/backgrounds/seleucid1_2.png"
+			round_coordinates="false"
+			fixed_h_aspect_ratio="2"
+		/>
+	</sprite>
+
+	<sprite name="background-seleucid1_3">
+		<image
+			texture="pregame/backgrounds/seleucid1_3.png"
+			round_coordinates="false"
+			wrap_mode="clamp_to_edge"
+		/>
+	</sprite>
+</sprites>