add a simple in-game IRC client

packaging/windows/OpenRA.nsi

@@ -104,6 +104,7 @@ Section "Game" GAME
 	File "${SRCDIR}\RestSharp.dll"
 	File "${SRCDIR}\GeoLite2-Country.mmdb.gz"
 	File "${SRCDIR}\eluant.dll"
+	File "${SRCDIR}\SmarIrc4net.dll"
 	File "${DEPSDIR}\soft_oal.dll"
 	File "${DEPSDIR}\SDL2.dll"
 	File "${DEPSDIR}\freetype6.dll"
@@ -214,6 +215,7 @@ Function ${UN}Clean
 	Delete $INSTDIR\eluant.dll
 	Delete $INSTDIR\freetype6.dll
 	Delete $INSTDIR\SDL2-CS.dll
+	Delete $INSTDIR\SmarIrc4net.dll
 	RMDir /r $INSTDIR\Support
 	
 	DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\OpenRA"