[headers 5] Misc small headers untangling (#2147)

* Misc small headers untangling

* mv gSaveContext to where it is in MM in the header

* newline police

* move rand functions back to functions.h

src/overlays/actors/ovl_En_Kanban/z_en_kanban.c

@@ -5,6 +5,7 @@
  */
 
 #include "z_en_kanban.h"
+#include "global.h"
 #include "assets/objects/gameplay_keep/gameplay_keep.h"
 #include "assets/objects/object_kanban/object_kanban.h"
 #include "terminal.h"

src/overlays/actors/ovl_En_Kanban/z_en_kanban.h

@@ -2,7 +2,7 @@
 #define Z_EN_KANBAN_H
 
 #include "ultra64.h"
-#include "global.h"
+#include "z64actor.h"
 
 struct EnKanban;
 

src/overlays/actors/ovl_Fishing/z_fishing.c

@@ -5,6 +5,7 @@
  */
 
 #include "z_fishing.h"
+#include "global.h"
 
 #include "overlays/actors/ovl_En_Kanban/z_en_kanban.h"
 #include "assets/objects/object_fish/object_fish.h"