Refactor ROM handling and remove SharedRom singleton for improved architecture

- Eliminated the SharedRom class to enhance modularity and reduce global state management.
- Updated various classes to directly manage ROM instances, improving clarity and encapsulation.
- Added new functions for loading messages and colors from ROM, enhancing functionality.
- Refactored Canvas and Editor classes to utilize direct ROM references, streamlining interactions.
- Improved documentation and comments for better code understanding and maintainability.

incl/zelda.h

@@ -86,7 +86,7 @@ const static zelda3_version_pointers zelda3_jp_pointers = {
 
 typedef struct zelda3_rom {
   const char* filename;
-  const uint8_t* data;
+  uint8_t* data;
   size_t size;
   void* impl;  // yaze::Rom*
 } zelda3_rom;
@@ -95,6 +95,19 @@ zelda3_rom* yaze_load_rom(const char* filename);
 void yaze_unload_rom(zelda3_rom* rom);
 void yaze_save_rom(zelda3_rom* rom, const char* filename);
 
+/**
+ * @brief Primitive of a message.
+ * 
+ */
+typedef struct zelda3_message {
+  uint8_t id;
+  uint8_t address;
+  uint8_t *raw_string;
+  uint8_t *contents_parsed;
+  uint8_t *data;
+  uint8_t *data_parsed;
+} zelda3_message;
+
 /**
  * @brief Primitive of an overworld map.
  */