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/cli/service/planning/tile16_proposal_generator.h

@@ -7,7 +7,7 @@
 
 #include "absl/status/status.h"
 #include "absl/status/statusor.h"
-#include "app/gfx/bitmap.h"
+#include "app/gfx/core/bitmap.h"
 #include "app/rom.h"
 
 namespace yaze {