lifting vs removing

<Someone> wrote:
> You have much trouble removing u - a helmet.
> You have much trouble lifting a plate mail. Continue? [ynq] (q)
> You have much trouble removing R - a plate mail.
> You have much trouble removing N - a leather cloak.
> Why am I told that I have trouble "lifting" a plate mail?

1. Add strsubst() routine to hacklib to replace a word or phrase in a string in place.
2. Correct the inconsistency reported.

src/pickup.c

@@ -1175,6 +1175,7 @@ boolean telekinesis;
 			(next_encumbr > HVY_ENCUMBER) ? overloadmsg :
 			(next_encumbr > MOD_ENCUMBER) ? nearloadmsg :
 			moderateloadmsg);
+		if (container) (void) strsubst(qbuf,"lifting","removing");
 		Sprintf(eos(qbuf), " %s. Continue?",
 			safe_qbuf(qbuf, sizeof(" . Continue?"),
 				doname(obj), an(simple_typename(obj->otyp)), "something"));