fix compile, fix clang-format, add demo window debug setting, add setting to stop at entry or go to main directly

src/frontend/frontend.h

@@ -44,10 +44,12 @@ namespace dbgui::frontend
 
 		bool _draw_metric_window = false;
 		bool _draw_stack_tool    = false;
+		bool _draw_demo_window   = false;
 
 		bool _draw_open_popup                  = false;
 		ImGuiID _open_popup_id                 = 0;
 		std::vector<char> _open_popup_name_buf = {};
+		bool _open_popup_stop_at_entry         = false;
 
 		std::vector<Window> _windows = {};
 	};