Use PlayState instead of GlobalContext (#1927)

* Use PlayState instead of GlobalContext
- GlobalContext -> PlayState
- globalCtx -> play
- GlobalCtx -> PlayState
- globalContext -> playState

* Find and replace Gameplay_ with Play_

* Correct some misnamed argument cases

soh/src/code/z_path.c

@@ -1,10 +1,10 @@
 #include "global.h"
 
-Path* Path_GetByIndex(GlobalContext* globalCtx, s16 index, s16 max) {
+Path* Path_GetByIndex(PlayState* play, s16 index, s16 max) {
     Path* path;
 
     if (index != max) {
-        path = &globalCtx->setupPathList[index];
+        path = &play->setupPathList[index];
     } else {
         path = NULL;
     }