Tutorial: add summon quintain animation to Delfador.
Tutorial: set initial facing directions for the player and Delfador
ai_helper.get_live_units: don't use filter_wml

It’s slow, the new method is between 10 and 20 times faster.
Lua AIs: do not use empty tables as filters

It’s faster not to provide any argument to wesnoth.get_units() if all
units are to be found.