Overhaul game state logic to support gameplay loop

Zennysoft.Game.Ma.Implementation/Game/state/GameState.Input.cs

@@ -0,0 +1,29 @@
+namespace Zennysoft.Ma.Adapter;
+
+public partial class GameState
+{
+  public static class Input
+  {
+    public readonly record struct NewGame;
+
+    public readonly record struct LoadGame;
+
+    public readonly record struct ContinueGame;
+
+    public readonly record struct ReturnToMainMenu;
+
+    public readonly record struct LoadNextFloor;
+
+    public readonly record struct InventoryButtonPressed;
+
+    public readonly record struct MiniMapButtonPressed;
+
+    public readonly record struct PauseButtonPressed;
+
+    public readonly record struct DebugButtonPressed;
+
+    public readonly record struct FloorExitEntered;
+
+    public readonly record struct GameOver;
+  }
+}