adding bools into player components to enable items in inventory

include/components/player_component.h

@@ -15,6 +15,7 @@ struct player_component
 {
     gc_component base;
     int fight_rate;
+    bool inventory_upgrades[4];
 };
 
 extern const struct player_component player_component;

include/systems/inventory.h

@@ -11,7 +11,7 @@
 #include "engine.h"
 #include <stdbool.h>
 
-void display_inventory_object(gc_scene *scene, struct renderer *rend, int nb);
+void display_inv_slot(gc_scene *scene, struct renderer *rend, int nb);
 bool toggle_inventory(gc_engine *engine);
 
 #endif //MY_RPG_INVENTORY_H