Refactor Plugins system to support plugins in C++ scripts

Source/Engine/Scripting/Plugins/Plugin.h

@@ -0,0 +1,46 @@
+// Copyright (c) 2012-2022 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "PluginDescription.h"
+#include "Engine/Scripting/ScriptingObject.h"
+
+/// <summary>
+/// Base class for game engine editor plugins.
+/// </summary>
+API_CLASS(Abstract) class FLAXENGINE_API Plugin : public ScriptingObject
+{
+    DECLARE_SCRIPTING_TYPE(Plugin);
+private:
+    friend class PluginManagerService;
+    bool _initialized = false;
+
+protected:
+    /// <remarks>
+    /// Plugin description. Should be a constant part of the plugin created in constructor and valid before calling <see cref="Initialize"/>.
+    /// </remarks>
+    API_FIELD() PluginDescription _description;
+
+public:
+    /// <summary>
+    /// Gets the description.
+    /// </summary>
+    API_PROPERTY() const PluginDescription& GetDescription() const
+    {
+        return _description;
+    }
+
+    /// <summary>
+    /// Initialization method called when this plugin is loaded to the memory and can be used.
+    /// </summary>
+    API_FUNCTION() virtual void Initialize()
+    {
+    }
+
+    /// <summary>
+    /// Cleanup method called when this plugin is being unloaded or reloaded or engine is closing.
+    /// </summary>
+    API_FUNCTION() virtual void Deinitialize()
+    {
+    }
+};