Reduce overlay dependencies on global.h (8) (#2478)

* move variables into z64environment.h

* z_room.h

* z64sram.h, z64ss_sram.h, z64font.h, kanread.h

* z64lifemeter.h, z64debug.h, debug_arena.h

* buffers.h

* remove z_bgcheck global

* gamealloc.h

* suggestions

* .bdd

src/code/gamealloc.c

@@ -1,4 +1,8 @@
-#include "global.h"
+#include "libc64/malloc.h"
+#include "libu64/debug.h"
+#include "gamealloc.h"
+
+#include "macros.h"
 
 void GameAlloc_Log(GameAlloc* this) {
     GameAllocEntry* iter;