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/match_call.c

@@ -1183,7 +1183,7 @@ static void StartMatchCall(void)
 {
     if (!sMatchCallState.triggeredFromScript)
     {
-        ScriptContext2_Enable();
+        LockPlayerFieldControls();
         FreezeObjectEvents();
         PlayerFreeze();
         StopPlayerAvatar();
@@ -1371,7 +1371,7 @@ static bool32 MatchCall_EndCall(u8 taskId)
             ObjectEventClearHeldMovementIfFinished(&gObjectEvents[playerObjectId]);
             ScriptMovement_UnfreezeObjectEvents();
             UnfreezeObjectEvents();
-            ScriptContext2_Disable();
+            UnlockPlayerFieldControls();
         }
 
         return TRUE;