[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/joker_effects.c

@@ -1,4 +1,5 @@
 #include "game.h"
+#include "game/round.h"
 #include "game_variables.h"
 #include "hand.h"
 #include "joker.h"
@@ -1034,7 +1035,7 @@ static u32 half_joker_effect(
 
     u32 effect_flags_ret = JOKER_EFFECT_FLAG_NONE;
 
-    int played_size = get_played_top() + 1;
+    int played_size = get_played_size();
     if (played_size <= 3)
     {
         *joker_effect = &shared_joker_effect;