[PTRun] PowerToys Run - plugin dependency loading (#30513)

* Updated the Wox.Plugin to correctly load and resolve plugin dependecies

* Included new plugin.props in all plugins to enable dynamic dependecy loading

* Updated dev docs to include new plugin.props in plugins

* Fixed double dependecy loading bug

* - Updated to only use dynamic loading when explicitly set by the plugin.
- Removed no longer required props from default plugins which do not need dynamic loading.
- Updated dev-docs to align with latest changes

* Removed line spacing changes in plugins csproj

* fixed spelling

* csproj cleanup

* removed unnecessary null checking

---------

Co-authored-by: Corey Hayward <coreyh@tigereyeconsulting.com>

doc/devdocs/modules/launcher/new-plugin-checklist.md

@@ -3,6 +3,7 @@
 - [ ] Microsoft plugin project name pattern: `Microsoft.PowerToys.Run.Plugin.{PluginName}`
 - [ ] Community plugin project name pattern: `Community.PowerToys.Run.Plugin.{PluginName}`
 - [ ] The project file should import `Version.props` and specify `<Version>$(Version).0</Version>`
+- [ ] If the plugin uses any 3rd party dependencies the project file should import `DynamicPlugin.props`
 - [ ] Make sure `*.csproj` specify only x64 platform target
 - [ ] The plugin has to contain a `plugin.json` file of the following format in its root folder
 ```
@@ -17,7 +18,8 @@
   "Website": "https://aka.ms/powertoys",
   "ExecuteFileName": string, // Should be {Type}.PowerToys.Run.Plugin.{PluginName}.dll
   "IcoPathDark": string, // Path to dark theme icon. The path is relative to the root plugin folder 
-  "IcoPathLight": string // Path to light theme icon. The path is relative to the root plugin folder 
+  "IcoPathLight": string // Path to light theme icon. The path is relative to the root plugin folder
+  "DynamicLoading": bool // Sets whether the plugin should dynamically load any dependencies isolated from the core application.  
 }
 ```
 - [ ] Make sure your `Main` class contains a public, static string property for the `PluginID`. The plugin id has to be the same as the one in the `plugin.json`file.

src/modules/launcher/Plugins/DynamicPlugin.props

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+  </PropertyGroup>
+  
+  <ItemDefinitionGroup>
+    <ProjectReference>
+      <Private Condition="'$(OutputType)' == 'library'">false</Private>
+    </ProjectReference>
+  </ItemDefinitionGroup>
+</Project>

src/modules/launcher/Wox.Plugin/PluginLoadContext.cs

@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.Loader;
+
+namespace Wox.Plugin
+{
+    internal class PluginLoadContext : AssemblyLoadContext
+    {
+        private AssemblyDependencyResolver _resolver;
+
+        public PluginLoadContext(string pluginPath)
+        {
+            _resolver = new AssemblyDependencyResolver(pluginPath);
+        }
+
+        protected override Assembly Load(AssemblyName assemblyName)
+        {
+            string assemblyPath = _resolver.ResolveAssemblyToPath(assemblyName);
+            if (assemblyPath != null)
+            {
+                var existingAssembly = Default.Assemblies.FirstOrDefault(x => x.FullName == assemblyName.FullName);
+                return existingAssembly ?? LoadFromAssemblyPath(assemblyPath);
+            }
+
+            return null;
+        }
+
+        protected override IntPtr LoadUnmanagedDll(string unmanagedDllName)
+        {
+            string libraryPath = _resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
+            if (libraryPath != null)
+            {
+                return LoadUnmanagedDllFromPath(libraryPath);
+            }
+
+            return IntPtr.Zero;
+        }
+    }
+}

src/modules/launcher/Wox.Plugin/PluginMetadata.cs

@@ -65,6 +65,8 @@ namespace Wox.Plugin
 
         public string IcoPathLight { get; set; }
 
+        public bool DynamicLoading { get; set; }
+
         public override string ToString()
         {
             return Name;

src/modules/launcher/Wox.Plugin/PluginPair.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Diagnostics;
+using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Runtime.Loader;
@@ -153,7 +154,15 @@ namespace Wox.Plugin
 
             try
             {
-                _assembly = AssemblyLoadContext.Default.LoadFromAssemblyPath(Metadata.ExecuteFilePath);
+                if (Metadata.DynamicLoading)
+                {
+                    var loadContext = new PluginLoadContext(Metadata.ExecuteFilePath);
+                    _assembly = loadContext.LoadFromAssemblyName(new AssemblyName(Path.GetFileNameWithoutExtension(Metadata.ExecuteFilePath)));
+                }
+                else
+                {
+                    _assembly = AssemblyLoadContext.Default.LoadFromAssemblyPath(Metadata.ExecuteFilePath);
+                }
             }
             catch (Exception e)
             {