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/battle_pyramid.c

@@ -1480,7 +1480,7 @@ u8 GetTrainerEncounterMusicIdInBattlePyramid(u16 trainerId)
 // Unused
 static void BattlePyramidRetireChallenge(void)
 {
-    ScriptContext1_SetupScript(BattlePyramid_Retire);
+    ScriptContext_SetupScript(BattlePyramid_Retire);
 }
 
 static u16 GetUniqueTrainerId(u8 objectEventId)