支持通过网页增加、删除、修改摄像头配置信息

支持摄像头配置信息中句柄的设置，并实测有效

SHH.CameraSdk/Drivers/HikVision/HikVideoSource.cs

@@ -228,7 +228,7 @@ public class HikVideoSource : BaseVideoSource
     {
         var previewInfo = new HikNativeMethods.NET_DVR_PREVIEWINFO
         {
-            hPlayWnd = IntPtr.Zero,
+            hPlayWnd = (IntPtr)_config.RenderHandle,
             lChannel = _config.ChannelIndex,
             dwStreamType = (uint)_config.StreamType,
             bBlocked = false