调整 Event 和 Editor 命名空间

- 将原来的 CustomEvent 调整到 SepCore.Event
- 将 Editor 文件夹下的统一到 SepCore.Editor，顺带修改了 Editor 程序集

Assets/GameMain/Scripts/Base/Event/Combat/ProjectileHitPresentationEventArgs.cs

@@ -2,7 +2,7 @@ using GameFramework;
 using GameFramework.Event;
 using UnityEngine;
 
-namespace CustomEvent
+namespace SepCore.Event
 {
     public sealed class ProjectileHitPresentationEventArgs : GameEventArgs
     {