Added MUSHclient_Help.xml plugin to installer

Author: nickgammon

install/mushclient.nsi

@@ -473,6 +473,7 @@ Section "Plugins"
   File "..\plugins\Hyperlink_URL.xml"
   File "..\plugins\InfoBox_Demo.xml"
   File "..\plugins\Installer_sumcheck.xml"
+  File "..\plugins\MUSHclient_Help.xml"
   File "..\plugins\MUSH_teleport.xml"
   File "..\plugins\Messages_Window.xml"
   File "..\plugins\MudDatabase.xml"
@@ -708,6 +709,8 @@ Section Uninstall
   Delete "$INSTDIR\worlds\plugins\Hyperlink_URL.xml"
   Delete "$INSTDIR\worlds\plugins\InfoBox_Demo.xml"
   Delete "$INSTDIR\worlds\plugins\Installer_sumcheck.xml"
+  Delete "$INSTDIR\worlds\plugins\MUSHclient_Help.xml"
+
   Delete "$INSTDIR\worlds\plugins\MUSH_teleport.xml"
   Delete "$INSTDIR\worlds\plugins\Messages_Window.xml"
   Delete "$INSTDIR\worlds\plugins\MudDatabase.xml"