Refactor dungeon and snes_color headers: reorder includes and update struct definitions for clarity

src/incl/dungeon.h

@@ -1,12 +1,12 @@
 #ifndef YAZE_BASE_DUNGEON_H_
 #define YAZE_BASE_DUNGEON_H_
 
-#include <stdint.h>
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+#include <stdint.h>
+
 struct object_door {
   object_door() = default;
   object_door(short id, uint8_t x, uint8_t y, uint8_t size, uint8_t layer)

src/incl/snes_color.h

@@ -10,22 +10,20 @@ extern "C" {
 /**
  * @brief Primitive of 16-bit RGB SNES color.
  */
-struct snes_color {
+typedef struct snes_color {
   uint16_t red;   /**< Red component of the color. */
   uint16_t blue;  /**< Blue component of the color. */
   uint16_t green; /**< Green component of the color. */
-};
-typedef struct snes_color snes_color;
+} snes_color;
 
 /**
  * @brief Primitive of a SNES color palette.
  */
-struct snes_palette {
+typedef struct snes_palette {
   unsigned int id;    /**< ID of the palette. */
   unsigned int size;  /**< Size of the palette. */
   snes_color* colors; /**< Pointer to the colors in the palette. */
-};
-typedef struct snes_palette snes_palette;
+} snes_palette;
 
 #ifdef __cplusplus
 }