Show warning dialog if NewGRFs use too many string IDs.

Show when reloading/changing NewGRF config, or starting new game.

src/openttd.cpp

@@ -982,6 +982,9 @@ static void MakeNewGameDone()
 {
 	SettingsDisableElrail(_settings_game.vehicle.disable_elrails);
 
+	extern void PostCheckNewGRFLoadWarnings();
+	PostCheckNewGRFLoadWarnings();
+
 	/* In a dedicated server, the server does not play */
 	if (!VideoDriver::GetInstance()->HasGUI()) {
 		SetLocalCompany(COMPANY_SPECTATOR);
@@ -1049,6 +1052,9 @@ static void MakeNewGame(bool from_heightmap, bool reset_settings)
 static void MakeNewEditorWorldDone()
 {
 	SetLocalCompany(OWNER_NONE);
+
+	extern void PostCheckNewGRFLoadWarnings();
+	PostCheckNewGRFLoadWarnings();
 }
 
 static void MakeNewEditorWorld()