Separate out the major UIs to get ready for their development, and enable debug button.

combat_ui.hpp

@@ -0,0 +1,18 @@
+#pragma once
+#include "panel.hpp"
+#include "levelmanager.hpp"
+#include <ftxui/component/component.hpp>
+
+namespace gui {
+  class CombatUI : public Panel {
+    public:
+      GameLevel $level;
+      Component $attack1_button;
+      Component $attack2_button;
+
+      CombatUI(GameLevel level);
+
+      void create_render();
+      void update_level(GameLevel &level) { $level = level; }
+  };
+}