Add to be able to specify order of plugin initialization and deinitialization.

Source/Engine/Scripting/Attributes/PluginLoadOrder.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace FlaxEngine;
+
+/// <summary>
+/// This attribute allows for specifying initialization and deinitialization order for plugins
+/// </summary>
+[Serializable]
+[AttributeUsage(AttributeTargets.Class)]
+public class PluginLoadOrderAttribute : Attribute
+{
+    /// <summary>
+    /// The plugin type to initialize this plugin after.
+    /// </summary>
+    public Type InitializeAfter;
+
+    /// <summary>
+    /// The plugin type to deinitialize this plugin before.
+    /// </summary>
+    public Type DeinitializeBefore;
+}