Plugins: Define IPlugin and IPluginOption interfaces

Il2CppInspector.Common/Plugins/API/V100/Hooks.cs

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+/*
+    Copyright 2020 Katy Coe - http://www.djkaty.com - https://github.com/djkaty
+
+    All rights reserved.
+*/
+
+namespace Il2CppInspector.PluginAPI.V100
+{
+    /// <summary>
+    /// Process global-metadata.dat after it has been loaded into a Metadata object
+    /// </summary>
+    public interface IPostProcessMetadata
+    {
+        void PostProcessMetadata(Metadata metadata);
+    }
+}