[Refactor] Separate Round logic into its own file (#570)

* Everything works, need to clean up

* cleanup

* fix rebase issue

* clang format

* docs

* clang format

* clang format

* address part of review

* Protect against edge case when discarding at end of hand

* Protect undiscard against popping a discarded card that doesn't exist

* Protect against out of bounds access to the `played` cards stack

* fix condition in `select_four_of_a_kind_cards_in_played_hand`

* change `get_played_top() + 1` to `get_played_size()`

* move `can_play/discard_hand` functions to round.c

---------

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

source/game/blind_select.c

@@ -309,8 +309,8 @@ static void game_blind_select_display_blind_panel()
 
 static void game_blind_select_exit(void)
 {
-    reset_background();
-    game_change_state(GAME_STATE_PLAYING);
+    change_background(BG_NONE, false);
+    game_change_state(GAME_STATE_ROUND);
 }
 
 static Rect game_blind_select_get_req_score_rect(enum BlindTokens blind)
@@ -484,7 +484,7 @@ void game_blind_select_on_exit(void)
     sprite_destroy(&blind_select_tokens[BIG_BLIND]);
     sprite_destroy(&blind_select_tokens[BOSS_BLIND]);
 
-    reset_background();
+    change_background(BG_NONE, false);
     selection_y = 0;
 
     state_machine_remove(&blind_select_sm);