I've decided to use the option in settings only for gameplay, and so always allowing the load of custom cards.
This is because otherwise the option should be much more pervasive, so inhibiting card catalog, sets filters, ...
So the option will just control the use of custom cards in decks for gameplay (still false by default!)
If Custom Card setting is disabled, an error message in logs will be printed accordingly.
Custom Cards will be loaded as such in Card Pool only if the option in settings is enabled.
A new Option has been added in Forge Preferences to enable the use of custom cards.
This option (default is False for backward compatibility) will control whether custom cards can be read in custom editions, and so decks containing them can be used in game matches.
Also, en-US translation file received an update to clarify what is intended with Unknonw cards (to be distinguished from custom cards now)
This also fixes a BUG for DeckSetFilter that did not update properly the list of filters in ItemManager.
This had the effect of not updating the labels for set filters for deck, after edit.
The method is implemented in the abstract super class (ItemManager) and so inherited by `CardManager` (where there is no format nor game type that could be used), and specialised by `DeckManager`.
In particular, the only current format with limitations on sets is Brawl, and so the only one accounted for.
In any case, the list of (unique) allowed sets is automatically inferred by default from the cardpool (as in the case of `CardManager`).
It is important to note that this filter is stored into an attribute, and so the list is calculated only once.
The results of this list will be passed on the `DialogChooseSets` to update the content of the dialog panel, accordingly.
There are cases in which the set filter should be initialised with the white list of allowed set codes, rather than the blacklist (i.e. unselectableSets).
This is the case of CardCatalog or DeckCatalog with constraints or limitations on card pool (i.e. restricted cards, and or restricted sets).
This new set of constructors with extra parameters allow to handle this cases, so that the UI can easily adapt.
