split link's HIO classes into a separate header

defining these in the .inc file means they can't be included into the other .inc files that use them, which results in annoying intellisense errors

src/d/actor/d_a_player_food.inc

@@ -11,9 +11,11 @@
  */
 
 #include "d/actor/d_a_player_main.h"
+#include "d/actor/d_a_player_HIO.h"
 #include "f_op/f_op_camera.h"
 #include "d/d_com_inf_game.h"
 #include "d/d_item_data.h"
+#include "d/d_procname.h"
 
 /* 80154334-801543A0       .text setHyoiModel__9daPy_lk_cFv */
 void daPy_lk_c::setHyoiModel() {

src/d/actor/d_a_player_main.cpp

@@ -9,6 +9,7 @@
  */
 
 #include "d/actor/d_a_player_main.h"
+#include "d/actor/d_a_player_HIO.h"
 #include "d/d_com_inf_game.h"
 #include "d/d_com_lib_game.h"
 #include "JSystem/JKernel/JKRHeap.h"