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/trader.c

@@ -109,7 +109,7 @@ void Task_BufferDecorSelectionAndCloseWindow(u8 taskId, u8 decorationId)
     RemoveWindow(tWindowId);
     ScheduleBgCopyTilemapToVram(0);
     DestroyTask(taskId);
-    EnableBothScriptContexts();
+    ScriptContext_Enable();
 }
 
 void Task_HandleGetDecorationMenuInput(u8 taskId)
@@ -186,14 +186,14 @@ void DecorationItemsMenuAction_Trade(u8 taskId)
         gSpecialVar_0x8006 = 0xFFFF;
     }
     DestroyTask(taskId);
-    EnableBothScriptContexts();
+    ScriptContext_Enable();
 }
 
 void ExitTraderMenu(u8 taskId)
 {
     gSpecialVar_0x8006 = 0;
     DestroyTask(taskId);
-    EnableBothScriptContexts();
+    ScriptContext_Enable();
 }
 
 void TraderDoDecorationTrade(void)