Refactor/game over screen (#468)

* Move game over (win/lose) state functions to their own file

* remove unused enum

* clang format

* Implement suggestions from @ricfehr3

* Fixing lack of highlighted button after skipping  ablind

* factorize as much game over state code as possible

---------

Co-authored-by: MathisMartin31 <mathis.martin31@gmail.com>

include/game.h

@@ -134,6 +134,17 @@ typedef struct
 
 // Game functions
 void game_init();
+
+/**
+ * @brief Called when exiting the Game Over screen (both win or lose) to reset game variables
+ *         and start a fresh new run.
+ *
+ * WARNING: This function is currently only meant to be called from the "GAME_OVER" state
+ * and shouldn't be called from other states, otherwise some data such as shop jokers
+ * may not be properly reset.
+ */
+void game_reset();
+
 void game_update();
 void game_change_state(enum GameState new_game_state);