refactor(gfx): reorganize graphics includes and introduce new types

- Updated include paths for various graphics-related headers to improve organization and clarity.
- Introduced new types for SNES color, palette, and tile management, enhancing the structure of the graphics subsystem.
- Refactored existing code to utilize the new types, ensuring consistency across the codebase.

Benefits:
- Improves maintainability and readability of the graphics code.
- Facilitates future enhancements and optimizations within the graphics subsystem.

src/app/gui/widgets/palette_editor_widget.h

@@ -4,7 +4,7 @@
 #include <functional>
 #include <vector>
 
-#include "app/gfx/snes_palette.h"
+#include "app/gfx/types/snes_palette.h"
 #include "app/rom.h"
 #include "imgui/imgui.h"
 

src/app/gui/widgets/palette_widget.cc

@@ -2,7 +2,7 @@
 
 #include <algorithm>
 #include <map>
-#include "app/gfx/arena.h"
+#include "app/gfx/resource/arena.h"
 #include "app/gui/color.h"
 #include "util/log.h"
 

src/app/gui/widgets/palette_widget.h

@@ -3,8 +3,8 @@
 
 #include <vector>
 #include <map>
-#include "app/gfx/snes_palette.h"
-#include "app/gfx/bitmap.h"
+#include "app/gfx/types/snes_palette.h"
+#include "app/gfx/core/bitmap.h"
 #include "app/rom.h"
 #include "imgui/imgui.h"
 

src/app/gui/widgets/tile_selector_widget.h

@@ -3,7 +3,7 @@
 
 #include <string>
 
-#include "app/gfx/bitmap.h"
+#include "app/gfx/core/bitmap.h"
 #include "app/gui/canvas.h"
 #include "imgui/imgui.h"