统一导出类结构

SpineViewer/Exporter/Implementations/ExportArgs/VideoExportArgs.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewer.Exporter.Implementations.ExportArgs
+{
+    /// <summary>
+    /// 视频导出参数基类
+    /// </summary>
+    public abstract class VideoExportArgs : SpineViewer.Exporter.ExportArgs
+    {
+        public VideoExportArgs(Size resolution, SFML.Graphics.View view, bool renderSelectedOnly) : base(resolution, view, renderSelectedOnly) { }
+
+        /// <summary>
+        /// 导出时长
+        /// </summary>
+        [Category("视频参数"), DisplayName("时长"), Description("可以从模型列表查看动画时长")]
+        public float Duration { get => duration; set => duration = Math.Max(0, value); }
+        private float duration = 1;
+
+        /// <summary>
+        /// 帧率
+        /// </summary>
+        [Category("视频参数"), DisplayName("帧率"), Description("每秒画面数")]
+        public float FPS { get; set; } = 60;
+    }
+}