Refactor window management and renderer integration for improved structure

- Replaced platform backend references with a dedicated Window class for better encapsulation of window and audio device management.
- Updated various files to include the new window header, enhancing clarity and reducing dependencies on the platform backend.
- Removed obsolete platform backend code to streamline the codebase and improve maintainability.
- Refactored controller and editor classes to utilize the new window management system, ensuring consistent handling of window creation and rendering.

src/app/zelda3/dungeon/room.cc

@@ -6,7 +6,7 @@
 #include <vector>
 
 #include "absl/strings/str_cat.h"
-#include "app/core/platform/renderer.h"
+#include "app/core/window.h"
 #include "app/gfx/arena.h"
 #include "app/rom.h"
 #include "app/snes.h"

src/app/zelda3/screen/dungeon_map.cc

@@ -4,7 +4,7 @@
 #include <vector>
 
 #include "app/core/platform/file_dialog.h"
-#include "app/core/platform/renderer.h"
+#include "app/core/window.h"
 #include "app/gfx/bitmap.h"
 #include "app/gfx/snes_tile.h"
 #include "app/gfx/tilemap.h"

src/app/zelda3/screen/inventory.cc

@@ -1,6 +1,6 @@
 #include "inventory.h"
 
-#include "app/core/platform/renderer.h"
+#include "app/core/window.h"
 #include "app/gfx/bitmap.h"
 #include "app/gfx/snes_tile.h"
 #include "app/rom.h"