uses portraits in the character selection and single click selection on pictures instead of buttons
also adds a dark background to hint messages to make them easier to read
adds arrow markers in the beginning on the units
When a unit data passed to `to_map` either lacks a side or has
side zero, implementation automatically sets it to 1, thus the
existing code worked fine. However:
1. The lack of a `side` could trigger a warning in EmmyLua. It
currently doesn't trigger that, but would with Celtic Minstrel's
planned improvements in Wesnoth's lint hints.
2. The tutorial should be good example code, and the special-case
in the C++ code that made this work is a case of "assume it's a
SP situation, and choose the result that benefits side 1".
This covers everything:
- SotA zombie dialog (was mostly converted already, just needed module name update)
- The remaining minor World Conquest dialogs that had yet to be converted
- Tutorial character select
- Test scenario sample dialog
This also replaces any uses of "callback" in favour of "on_xxx".
Also backtracked the removal of wesnoth.get_recall_units, which is now available as wesnoth.units.find_on_recall - it's just more convenient than passing x=recall to wesnoth.units.find
Do not show traits in the wiki for Li'sar and Konrad, since they can't get them.
Li'sars new sprite seems to use rather a sword than a saber.
Copied defense animation for Li'sar from HttT.
Changed lua due to deprecation warning.
[ci skip]
