整理代码结构，支持Package Manager添加

Scripts/Runtime/Component/Sub/Emphasis.cs

@@ -0,0 +1,35 @@
+/******************************************/
+/*                                        */
+/*     Copyright (c) 2018 monitor1394     */
+/*     https://github.com/monitor1394     */
+/*                                        */
+/******************************************/
+
+
+using UnityEngine;
+
+namespace XCharts
+{
+    /// <summary>
+    /// 高亮的图形样式和文本标签样式。
+    /// </summary>
+    [System.Serializable]
+    public class Emphasis : SubComponent
+    {
+        [SerializeField] private bool m_Show;
+        [SerializeField] private SerieLabel m_Label = new SerieLabel();
+        [SerializeField] private ItemStyle m_ItemStyle = new ItemStyle();
+        /// <summary>
+        /// 是否启用高亮样式。
+        /// </summary>
+        public bool show { get { return m_Show; } set { m_Show = value; } }
+        /// <summary>
+        /// 图形文本标签。
+        /// </summary>
+        public SerieLabel label { get { return m_Label; } }
+        /// <summary>
+        /// 图形样式。
+        /// </summary>
+        public ItemStyle itemStyle { get { return m_ItemStyle; } }
+    }
+}