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/move_relearner.c

@@ -365,7 +365,7 @@ static void VBlankCB_MoveRelearner(void)
 // Script arguments: The pokemon to teach is in VAR_0x8004
 void TeachMoveRelearnerMove(void)
 {
-    ScriptContext2_Enable();
+    LockPlayerFieldControls();
     CreateTask(Task_WaitForFadeOut, 10);
     // Fade to black
     BeginNormalPaletteFade(PALETTES_ALL, 0, 0, 0x10, RGB_BLACK);