Renaming Script Contexts

- Determined how the various script contexts were used and renamed accordingly.
- ScriptContext2_Enable/Disable => Lock/UnlockPlayerFieldControls - The sole purpose of the flag is to make sure the player can't move around in the overworld. It has nothing to do with script contexts.
- ScriptContext1 => ScriptContext - It is the global script context used to set up scripts which run over many frames.
- ScriptContext2_RunNewScript => RunScriptImmediately - ScriptContext2's sole purpose was to run scripts immediately and in a separate context, usually while the global context is waiting for things like map loads or screen changes.

src/field_special_scene.c

@@ -251,7 +251,7 @@ static void Task_HandleTruckSequence(u8 taskId)
             DrawWholeMapView();
             PlaySE(SE_TRUCK_DOOR);
             DestroyTask(taskId);
-            ScriptContext2_Disable();
+            UnlockPlayerFieldControls();
         }
         break;
     }
@@ -263,7 +263,7 @@ void ExecuteTruckSequence(void)
     MapGridSetMetatileIdAt(4 + MAP_OFFSET, 2 + MAP_OFFSET, METATILE_InsideOfTruck_DoorClosedFloor_Mid);
     MapGridSetMetatileIdAt(4 + MAP_OFFSET, 3 + MAP_OFFSET, METATILE_InsideOfTruck_DoorClosedFloor_Bottom);
     DrawWholeMapView();
-    ScriptContext2_Enable();
+    LockPlayerFieldControls();
     CpuFastFill(0, gPlttBufferFaded, 0x400);
     CreateTask(Task_HandleTruckSequence, 0xA);
 }
@@ -371,7 +371,7 @@ void FieldCB_ShowPortholeView(void)
     gObjectEvents[gPlayerAvatar.objectEventId].invisible = TRUE;
     FadeInFromBlack();
     CreateTask(Task_HandlePorthole, 80);
-    ScriptContext2_Enable();
+    LockPlayerFieldControls();
 }
 
 void LookThroughPorthole(void)