Plugins - Fixed cancelling prerequisite installation

Plugins - Tweaked prerequisite installation popup size
Account settings - Added personal access token management
Workshop - Added plugin loading, installing and removal

src/Artemis.Core/Services/Interfaces/IPluginManagementService.cs

@@ -12,6 +12,11 @@ namespace Artemis.Core.Services;
 /// </summary>
 public interface IPluginManagementService : IArtemisService, IDisposable
 {
+    /// <summary>
+    ///     Gets a list containing additional directories in which plugins are located, used while loading plugins.
+    /// </summary>
+    List<DirectoryInfo> AdditionalPluginDirectories { get; }
+    
     /// <summary>
     ///     Indicates whether or not plugins are currently being loaded
     /// </summary>

src/Artemis.Core/Services/PluginManagementService.cs

@@ -78,8 +78,11 @@ internal class PluginManagementService : IPluginManagementService
             File.Create(Path.Combine(pluginDirectory.FullName, "artemis.lock")).Close();
     }
 
+    public List<DirectoryInfo> AdditionalPluginDirectories { get; } = new();
+
     public bool LoadingPlugins { get; private set; }
 
+
     #region Built in plugins
 
     public void CopyBuiltInPlugins()
@@ -276,6 +279,18 @@ internal class PluginManagementService : IPluginManagementService
             }
         }
 
+        foreach (DirectoryInfo directory in AdditionalPluginDirectories)
+        {
+            try
+            {
+                LoadPlugin(directory);
+            }
+            catch (Exception e)
+            {
+                _logger.Warning(new ArtemisPluginException($"Failed to load plugin at {directory}", e), "Plugin exception");
+            }
+        }
+
         // ReSharper disable InconsistentlySynchronizedField - It's read-only, idc
         _logger.Debug("Loaded {count} plugin(s)", _plugins.Count);