Refactor/hand (#490)

* move all hand funcs to their new file. now to clean up

* WIP

* Cleanup + doc hand.h

* clang format

* Refactor loose variables in hand.c into a proper Hand struct

* Fix some more issues

* Apply *some* suggestions from code review

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* remove outdated comment

* fix rebase issue

* fix rng_info missing from g_game_vars init

---------

Co-authored-by: MathisMartin31 <mathis.martin31@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

include/game_variables.h

@@ -27,6 +27,8 @@
 #define MAX_HANDS    4
 #define MAX_DISCARDS 4
 
+#define DEFAULT_HAND_SIZE 8
+
 /**
  * @brief A central location for all game variables.
  *
@@ -45,6 +47,7 @@ typedef struct
     s32 round;
     s32 ante;
     s32 money;
+    s32 hand_size;
 
     // Blind variables