treat banned plugins like out of date, dont load but allow update

Dalamud/Plugin/Internal/Exceptions/BannedPluginException.cs

@@ -0,0 +1,22 @@
+namespace Dalamud.Plugin.Internal.Exceptions
+{
+    /// <summary>
+    /// This represents a banned plugin that attempted an operation.
+    /// </summary>
+    internal class BannedPluginException : PluginException
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="BannedPluginException"/> class.
+        /// </summary>
+        /// <param name="message">The message describing the invalid operation.</param>
+        public BannedPluginException(string message)
+        {
+            this.Message = message;
+        }
+
+        /// <summary>
+        /// Gets the message describing the invalid operation.
+        /// </summary>
+        public override string Message { get; }
+    }
+}

Dalamud/Plugin/Internal/LocalPlugin.cs

@@ -222,6 +222,9 @@ namespace Dalamud.Plugin.Internal
                     throw new InvalidPluginOperationException($"Unable to load {this.Name}, unload previously faulted, restart Dalamud");
             }
 
+            if (pluginManager.IsManifestBanned(this.Manifest))
+                throw new BannedPluginException($"Unable to load {this.Name}, banned");
+
             if (this.Manifest.ApplicableVersion < startInfo.GameVersion)
                 throw new InvalidPluginOperationException($"Unable to load {this.Name}, no applicable version");
 

Dalamud/Plugin/Internal/PluginManager.cs

@@ -548,6 +548,11 @@ namespace Dalamud.Plugin.Internal
                     PluginLocations.Remove(plugin.AssemblyName.FullName);
                     throw;
                 }
+                catch (BannedPluginException)
+                {
+                    // Out of date plugins get added so they can be updated.
+                    Log.Information($"Plugin was banned, adding anyways: {dllFile.Name}");
+                }
                 catch (Exception ex)
                 {
                     if (plugin.IsDev)
@@ -936,7 +941,12 @@ namespace Dalamud.Plugin.Internal
             return true;
         }
 
-        private bool IsManifestBanned(PluginManifest manifest)
+        /// <summary>
+        /// Determine if a plugin has been banned by inspecting the manifest.
+        /// </summary>
+        /// <param name="manifest">Manifest to inspect.</param>
+        /// <returns>A value indicating whether the plugin/manifest has been banned.</returns>
+        public bool IsManifestBanned(PluginManifest manifest)
         {
             return this.bannedPlugins.Any(ban => ban.Name == manifest.InternalName && ban.AssemblyVersion == manifest.AssemblyVersion);
         }