feat: add ban reason in the installer

Dalamud/Interface/Internal/Windows/PluginInstallerWindow.cs

@@ -1430,7 +1430,7 @@ namespace Dalamud.Interface.Internal.Windows
                     ImGui.TextWrapped(manifest.Description);
                 }
 
-                if (plugin.IsOutdated)
+                if (plugin.IsOutdated && !plugin.IsBanned)
                 {
                     ImGui.PushStyleColor(ImGuiCol.Text, ImGuiColors.DalamudRed);
                     ImGui.TextWrapped(Locs.PluginBody_Outdated);
@@ -1440,7 +1440,10 @@ namespace Dalamud.Interface.Internal.Windows
                 if (plugin.IsBanned)
                 {
                     ImGui.PushStyleColor(ImGuiCol.Text, ImGuiColors.DalamudRed);
-                    ImGui.TextWrapped(Locs.PluginBody_Banned);
+                    ImGui.TextWrapped(plugin.BanReason.IsNullOrEmpty()
+                                          ? Locs.PluginBody_Banned
+                                          : Locs.PluginBody_BannedReason(plugin.BanReason));
+
                     ImGui.PopStyleColor();
                 }
 
@@ -2436,6 +2439,9 @@ namespace Dalamud.Interface.Internal.Windows
 
             public static string PluginBody_Banned => Loc.Localize("InstallerBannedPluginBody ", "This plugin version is banned due to incompatibilities and not available at the moment. Please wait for it to be updated by its author.");
 
+            public static string PluginBody_BannedReason(string message) =>
+                Loc.Localize("InstallerBannedPluginBodyReason ", "This plugin is banned: {0}").Format(message);
+
             #endregion
 
             #region Plugin buttons

Dalamud/Plugin/Internal/LocalPlugin.cs

@@ -132,6 +132,7 @@ namespace Dalamud.Plugin.Internal
 
             var pluginManager = Service<PluginManager>.Get();
             this.IsBanned = pluginManager.IsManifestBanned(this.Manifest);
+            this.BanReason = pluginManager.GetBanReason(this.Manifest);
 
             this.SaveManifest();
         }
@@ -167,6 +168,11 @@ namespace Dalamud.Plugin.Internal
         /// </summary>
         public string Name => this.instance?.Name ?? this.Manifest.Name ?? this.DllFile.Name;
 
+        /// <summary>
+        /// Gets an optional reason, if the plugin is banned.
+        /// </summary>
+        public string BanReason { get; }
+
         /// <summary>
         /// Gets a value indicating whether the plugin is loaded and running.
         /// </summary>

Dalamud/Plugin/Internal/PluginManager.cs

@@ -954,6 +954,16 @@ namespace Dalamud.Plugin.Internal
             return this.bannedPlugins.Any(ban => ban.Name == manifest.InternalName && ban.AssemblyVersion == manifest.AssemblyVersion);
         }
 
+        /// <summary>
+        /// Get the reason of a banned plugin by inspecting the manifest.
+        /// </summary>
+        /// <param name="manifest">Manifest to inspect.</param>
+        /// <returns>The reason of the ban, if any.</returns>
+        public string GetBanReason(PluginManifest manifest)
+        {
+            return this.bannedPlugins.FirstOrDefault(ban => ban.Name == manifest.InternalName).Reason;
+        }
+
         private void DetectAvailablePluginUpdates()
         {
             var updatablePlugins = new List<AvailablePluginUpdate>();
@@ -1024,6 +1034,9 @@ namespace Dalamud.Plugin.Internal
 
             [JsonProperty]
             public Version AssemblyVersion { get; private set; }
+
+            [JsonProperty]
+            public string Reason { get; private set; }
         }
 
         private struct PluginDef