Fix base hooks being unsubscribed from

Some plugins will unsubscribe from hooks that are required for core functionality. This fixes that by adding a check to make sure the hook doesn't contain a call to a base method.

src/Oxide.Core.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project>
   <Import Project="Sdk.props" Sdk="Microsoft.NET.Sdk" />
   <Import Project="..\netfx.props" />

src/Plugins/CSPlugin.cs

@@ -1,6 +1,7 @@
 using Oxide.Core.Libraries;
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Reflection;
 
 namespace Oxide.Core.Plugins
@@ -115,6 +116,16 @@ protected void AddHookMethod(string name, MethodInfo method)
             hookMethods.Add(new HookMethod(method));
         }
 
+        internal override bool IsBaseHook(string name)
+        {
+            if (string.IsNullOrEmpty(name))
+            {
+                return false;
+            }
+
+            return Hooks.TryGetValue(name, out List<HookMethod> hooks) && hooks.Any(h => h.IsBaseHook);
+        }
+
         /// <summary>
         /// Calls the specified hook on this plugin
         /// </summary>

src/Plugins/Plugin.cs

@@ -327,6 +327,8 @@ public object CallHook(string hook, params object[] args)
         /// <returns></returns>
         protected abstract object OnCallHook(string hook, object[] args);
 
+        internal virtual bool IsBaseHook(string name) => false;
+
         /// <summary>
         /// Raises an error on this plugin
         /// </summary>

src/Plugins/PluginManager.cs

@@ -144,7 +144,7 @@ internal void SubscribeToHook(string hook, Plugin plugin)
         /// <param name="plugin"></param>
         internal void UnsubscribeToHook(string hook, Plugin plugin)
         {
-            if (!loadedPlugins.ContainsKey(plugin.Name) || !plugin.IsCorePlugin && (hook.StartsWith("IOn") || hook.StartsWith("ICan")))
+            if (!loadedPlugins.ContainsKey(plugin.Name) || !plugin.IsCorePlugin && (hook.StartsWith("IOn") || hook.StartsWith("ICan")) || plugin.IsBaseHook(hook))
             {
                 return;
             }