Use (civ-specific) standards to show formations.

Since we can have battalion-style formations (a70a20fd42), it is nice to
show a TW-style banner for them.
Code adapted from @Silier at
https://wildfiregames.com/forum/topic/68008-formation-standards-total-war-style-flags-over-battalions/.

Differential revision: https://code.wildfiregames.com/D4467
Comments by: @asterix, @Silier
Refs. #4545

This was SVN commit r26326.

binaries/data/mods/public/simulation/components/Formation.js

@@ -981,6 +981,8 @@ Formation.prototype.OnGlobalOwnershipChanged = function(msg)
 	// controlled by this formation.
 	if (this.members.indexOf(msg.entity) != -1)
 		this.RemoveMembers([msg.entity]);
+	if (msg.entity === this.entity && msg.to !== INVALID_PLAYER)
+		Engine.QueryInterface(this.entity, IID_Visual)?.SetVariant("animationVariant", QueryPlayerIDInterface(msg.to, IID_Identity).GetCiv());
 };
 
 Formation.prototype.OnGlobalEntityRenamed = function(msg)

binaries/data/mods/public/simulation/templates/template_formation.xml

@@ -14,12 +14,6 @@
       </Texture>
     </Overlay>
   </Selectable>
-  <VisualActor>
-    <Actor>props/special/common/waypoint_flag.xml</Actor>
-    <SilhouetteDisplay>true</SilhouetteDisplay>
-    <SilhouetteOccluder>false</SilhouetteOccluder>
-    <VisibleInAtlasOnly>false</VisibleInAtlasOnly>
-  </VisualActor>
   -->
   <Formation>
     <RequiredMemberCount>2</RequiredMemberCount>
@@ -76,4 +70,10 @@
     <PassabilityClass>large</PassabilityClass>
     <Weight>100</Weight>
   </UnitMotion>
+  <VisualActor>
+    <Actor>props/special/common/waypoint_flag.xml</Actor>
+    <SilhouetteDisplay>true</SilhouetteDisplay>
+    <SilhouetteOccluder>false</SilhouetteOccluder>
+    <VisibleInAtlasOnly>false</VisibleInAtlasOnly>
+  </VisualActor>
 </Entity>