- scriptified Hexen's bats.

- removed AMinotaurFriend::IsOkayToAttack. The condition it checks (i.e. friendliness with player) is already covered by the base version of this function so this is quite redundant.
- removed a few 'virtual' qualifiers from functions that never get overridden.

src/p_mobj.cpp

@@ -6885,6 +6885,14 @@ DEFINE_ACTION_FUNCTION(AActor, AddZ)
 	return 0;
 }
 
+DEFINE_ACTION_FUNCTION(AActor, SetZ)
+{
+	PARAM_SELF_PROLOGUE(AActor);
+	PARAM_FLOAT(z);
+	self->SetZ(z);
+	return 0;
+}
+
 DEFINE_ACTION_FUNCTION(AActor, SetDamage)
 {
 	PARAM_SELF_PROLOGUE(AActor);