CHOP-959: Introduce CmdLineChannel settings var, map --channel to it.

indra/newview/app_settings/cmd_line.xml

@@ -22,7 +22,8 @@
     <map>
       <key>count</key>
       <integer>1</integer>
-      <!-- Special case. Not mapped to a setting. -->
+      <key>map-to</key>
+      <string>CmdLineChannel</string>
     </map>
 
     <key>console</key>

indra/newview/app_settings/settings.xml

@@ -1749,6 +1749,17 @@
       <key>Value</key>
       <integer>0</integer>
     </map>
+    <key>CmdLineChannel</key>
+    <map>
+      <key>Comment</key>
+      <string>Command line specified channel name</string>
+      <key>Persist</key>
+      <integer>0</integer>
+      <key>Type</key>
+      <string>String</string>
+      <key>Value</key>
+      <string />
+    </map>
     <key>CmdLineDisableVoice</key>
     <map>
       <key>Comment</key>

indra/newview/llappviewer.cpp

@@ -2536,9 +2536,10 @@ bool LLAppViewer::initConfiguration()
         }
     }
 
-    if(clp.hasOption("channel"))
-    {
-		LLVersionInfo::resetChannel(clp.getOption("channel")[0]);
+	std::string CmdLineChannel(gSavedSettings.getString("CmdLineChannel"));
+	if(! CmdLineChannel.empty())
+	{
+		LLVersionInfo::resetChannel(CmdLineChannel);
 	}
 
 	// If we have specified crash on startup, set the global so we'll trigger the crash at the right time