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/fldeff_strength.c

@@ -30,7 +30,7 @@ bool8 SetUpFieldMove_Strength(void)
 static void FieldCallback_Strength(void)
 {
     gFieldEffectArguments[0] = GetCursorSelectionMonId();
-    ScriptContext1_SetupScript(EventScript_UseStrength);
+    ScriptContext_SetupScript(EventScript_UseStrength);
 }
 
 bool8 FldEff_UseStrength(void)
@@ -46,5 +46,5 @@ bool8 FldEff_UseStrength(void)
 static void StartStrengthFieldEffect(void)
 {
     FieldEffectActiveListRemove(FLDEFF_USE_STRENGTH);
-    EnableBothScriptContexts();
+    ScriptContext_Enable();
 }