Remove "action" from Actor functions that don't actually need it

- An actor function really only needs to be an action function if:
  1. It can be called with no parameters specified, either because it takes
     none or because all its parameters are optional. This lets SetState()
     call it directly without creating a wrapper function for it.
  2. It wants access to the callingstate or stateowner parameters. Most
     functions don't care about them, so passing them is superfluous.

src/p_enemy.cpp

@@ -2773,7 +2773,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_VileChase)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_ExtChase)
 {
-	PARAM_ACTION_PROLOGUE;
+	PARAM_SELF_PROLOGUE(AActor);
 	PARAM_BOOL		(domelee);
 	PARAM_BOOL		(domissile);
 	PARAM_BOOL_OPT	(playactive)	{ playactive = true; }