Add a button to the gamesetup to reset the selected civilizations of all players to random.

Code by Sandarac, icon by Lionkanzen, fixes #3805.

This was SVN commit r18239.

binaries/data/mods/public/gui/common/sprite1.xml

@@ -196,6 +196,20 @@
 		/>
 	</sprite>
 
+	<sprite name="iconResetGold">
+		<effect	add_color="237 227 167" />
+		<image 	texture="global/icon/reset.png"
+			size="0 3 100% 100%+3"
+		/>
+	</sprite>
+
+	<sprite name="iconResetWhite">
+		<effect	add_color="255 255 255" />
+		<image 	texture="global/icon/reset.png"
+			size="0 3 100% 100%+3"
+		/>
+	</sprite>
+
 
 	<!--
 	==========================================

binaries/data/mods/public/gui/gamesetup/gamesetup.js

@@ -1396,6 +1396,8 @@ function updateGUIObjects()
 	                  "exploreMap", "disableTreasures", "lockTeams"])
 		hideControl(ctrl, ctrl + "Text", notScenario);
 
+	Engine.GetGUIObjectByName("civResetButton").hidden = !notScenario;
+
 	for (let i = 0; i < g_MaxPlayers; ++i)
 	{
 		Engine.GetGUIObjectByName("playerBox["+i+"]").hidden = (i >= numPlayers);
@@ -1816,6 +1818,14 @@ function showMoreOptions(show)
 	Engine.GetGUIObjectByName("moreOptions").hidden = !show;
 }
 
+function resetCivilizations()
+{
+	for (let i in g_GameAttributes.settings.PlayerData)
+		g_GameAttributes.settings.PlayerData[i].Civ = "random";
+
+	updateGameAttributes();
+}
+
 function toggleReady()
 {
 	g_IsReady = !g_IsReady;

binaries/data/mods/public/gui/gamesetup/gamesetup.xml

@@ -65,6 +65,16 @@
 							Engine.PushGuiPage("page_civinfo.xml");
 						]]></action>
 					</object>
+					<object name="civResetButton"
+						type="button"
+						sprite="iconResetGold"
+						sprite_over="iconResetWhite"
+						size="67.5%+93 0 67.5%+109 16"
+						tooltip_style="onscreenToolTip"
+					>
+						<translatableAttribute id="tooltip">Reset any civilizations that have been selected to the default (random)</translatableAttribute>
+						<action on="Press">resetCivilizations();</action>
+					</object>
 					<object name="playerTeamHeading" type="text" style="ModernLabelText" size="85%+5 0 100%-5 100%">
 						<translatableAttribute id="caption">Team</translatableAttribute>
 					</object>