For now, combat table support was dropped. Will be reimplemented later.
Combat field buttons removed, new add_hitpoints method.
add_hitpoints now add the changed char to the end of the list.
A new subtract_hitpoints was created and linked within the dmg button.
the old methods 'curar' and 'causar_dano' were removed.
A new method called 'delete_char' created to remove chars from the listbox and from char list as well.
The old method 'remover' was removed.
New method 'calculate_xp' that uses PathFinder XP Rewards by default.

The old method 'calculaxp' was removed.
The new method can receive a list of tuples containing level and reward, something like [(1, 200), (2, 400))] wich is named as 'xp_table'.
More resilience for save and open methods.

The file dialogs will be destroyed all times now.
Support for autoselect definition on the get_or_select_listbox_item.

 In future, as default, just the shift_turn method will allow the use of autoselect definition.

 All others methods will require a selection before the action.
get_or_select_listbox_item docstring updated.
Solved a bug of the last item selection of char listbox.
The shift method now uses the new autosolect definition to select listbox chars.