add AppearCondition.Fools23 for installer category which checks date, remove popup for now

Dalamud/Fools/FoolsManager.cs

@@ -165,6 +165,12 @@ internal class FoolsManager : IDisposable, IServiceType
         };
     }
 
+    public bool CheckIsApplicableAprilFoolsTime()
+    {
+        var now = DateTime.Now;
+        return now is { Year: 2023, Month: 4, Day: 1 };
+    }
+
     public void ActivatePlugin(string plugin)
     {
         if (this.ActivatedPlugins.ContainsKey(plugin))
@@ -238,10 +244,12 @@ internal class FoolsManager : IDisposable, IServiceType
             return;
         }
 
+        /*
         var di = Service<DalamudInterface>.Get();
         di.OpenFoolsWindow();
 
         dalamudConfig.HasSeenFools23 = true;
         dalamudConfig.QueueSave();
+        */
     }
 }

Dalamud/Interface/Internal/PluginCategoryManager.cs

@@ -28,7 +28,7 @@ internal class PluginCategoryManager
         new(11, "special.devIconTester", () => Locs.Category_IconTester),
         new(12, "special.dalamud", () => Locs.Category_Dalamud),
         new(13, "special.plugins", () => Locs.Category_Plugins),
-        new(14, "special.alternateReality", () => "Alternate Reality"),
+        new(14, "special.alternateReality", () => "Alternate Reality", CategoryInfo.AppearCondition.Fools23),
         new(FirstTagBasedCategoryId + 0, "other", () => Locs.Category_Other),
         new(FirstTagBasedCategoryId + 1, "jobs", () => Locs.Category_Jobs),
         new(FirstTagBasedCategoryId + 2, "ui", () => Locs.Category_UI),
@@ -362,6 +362,8 @@ internal class PluginCategoryManager
             /// Check if plugin testing is enabled.
             /// </summary>
             DoPluginTest,
+
+            Fools23,
         }
 
         /// <summary>

Dalamud/Interface/Internal/Windows/PluginInstaller/PluginInstallerWindow.cs

@@ -1150,6 +1150,10 @@ internal class PluginInstallerWindow : Window, IDisposable
                             if (!Service<DalamudConfiguration>.Get().DoPluginTest)
                                 continue;
                             break;
+                        case PluginCategoryManager.CategoryInfo.AppearCondition.Fools23:
+                            if (!Service<FoolsManager>.Get().CheckIsApplicableAprilFoolsTime())
+                                continue;
+                            break;
                         default:
                             throw new ArgumentOutOfRangeException();
                     }
@@ -1293,6 +1297,20 @@ internal class PluginInstallerWindow : Window, IDisposable
     {
         var manager = Service<FoolsManager>.Get();
 
+        ImGui.TextWrapped(@"
+A team of scientists and plugin developers have collaborated to create a new
+version of Dalamud that includes plugins from other realities.
+
+With our high tech systems, the plugin installer now offers new and unique
+plugins with endless possibilities.
+
+We hope you enjoy this new version of Dalamud, and we look forward to your feedback.
+".Trim());
+
+        ImGuiHelpers.ScaledDummy(8);
+        ImGui.SameLine();
+        ImGuiHelpers.ScaledDummy(8);
+
         foreach (var plugin in manager.FoolsPlugins)
         {
             // dropdown