SH-3231 FIX Process new texture fetch url from login.cgi

- Added a new global setting (non-persist) to store the texture request URL
  - New setting is 'AgentAppearanceServiceURL'

indra/newview/app_settings/settings.xml

@@ -71,6 +71,17 @@
       <key>Value</key>
       <integer>0</integer>
     </map>
+    <key>AgentAppearanceServiceURL</key>
+    <map>
+      <key>Comment</key>
+      <string>Current Session Agent Appearance Service URL</string>
+      <key>Persist</key>
+      <integer>0</integer>
+      <key>Type</key>
+      <string>String</string>
+      <key>Value</key>
+      <string></string>
+    </map>
     <key>AlertedUnsupportedHardware</key>
     <map>
       <key>Comment</key>

indra/newview/llstartup.cpp

@@ -3442,6 +3442,14 @@ bool process_login_success_response()
 
 	}
 
+	// set the location of the Agent Appearance service, from which we can request
+	// avatar baked textures if they are supported by the current region
+	std::string agent_appearance_url = response["agent_appearance_service"];
+	if (!agent_appearance_url.empty())
+	{
+		gSavedSettings.setString("AgentAppearanceServiceURL", agent_appearance_url);
+	}
+
 	// Set the location of the snapshot sharing config endpoint
 	std::string snapshot_config_url = response["snapshot_config_url"];
 	if(!snapshot_config_url.empty())