Reference TMs and HMs by move instead of number (#1732)

constants/constants.inc

@@ -1,2 +1,3 @@
 	.include "constants/gba_constants.inc"
 	.include "constants/global.inc"
+	.include "constants/tms_hms.inc"

constants/tms_hms.inc

@@ -0,0 +1,17 @@
+#include "constants/tms_hms.h"
+
+/* Expands to:
+* enum_start ITEM_TM01
+* enum ITEM_TM_FOCUS_PUNCH
+* ...
+* enum_start ITEM_HM01
+* enum ITEM_HM_CUT
+* ... */
+#define EQUIV_TM(id) enum ITEM_TM_ ## id;
+#define EQUIV_HM(id) enum ITEM_HM_ ## id;
+	enum_start ITEM_TM01
+FOREACH_TM(EQUIV_TM)
+	enum_start ITEM_HM01
+FOREACH_HM(EQUIV_HM)
+#undef EQUIV_TM
+#undef EQUIV_HM