Plugins: Define IPlugin and IPluginOption interfaces

Il2CppInspector.Common/Plugins/API/V101/Adapter.cs

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+/*
+    Copyright 2020 Katy Coe - http://www.djkaty.com - https://github.com/djkaty
+
+    All rights reserved.
+*/
+
+/// This is an example for future use of how to enable backwards-compatibility
+/// by allowing newer versions of Il2CppInspector to load plugins made with older API versions
+
+using System.Collections.Generic;
+/*
+namespace Il2CppInspector.PluginAPI.V101
+{
+    /// <summary>
+    /// Converts a V100 plugin to a V101 plugin
+    /// </summary>
+    public class Adapter : IPlugin
+    {
+        private V100.IPlugin plugin;
+        public Adapter(V100.IPlugin plugin) => this.plugin = plugin;
+
+        // Fill in missing interface contract
+        public string Id => plugin.Id;
+        public string Name => plugin.Name;
+        public string Version => plugin.Version;
+        public string Description => plugin.Description;
+        public List<V100.IPluginOption> Options => plugin.Options;
+    }
+}
+*/