download: reworked scryfall images support:

- download: fixed unmount zip errors on cancel download in some use cases (closes #12536);
- download: significant download speed improvements (now it depends on user's network speed, not api limitations);
- download: added additional error dialogs on bad use cases;
- scryfall: added cards and bulk data api support;
- scryfall: added bulk data download (updates once per week, contains all scryfall cards and store in images\downloading folder, 2 GB size);
- scryfall: added optimized images download without api usage (use direct images links from bulk data, closes #11576);
- scryfall: improved image source searching for some use cases (miss or wrong images problems, closes #12511);
- scryfall: tokens don't use bulk data;
- scryfall: 75k small images downloads 40 minutes and takes 1 GB and 2100 api calls (most of it from tokens);
- scryfall: how-to disable bulk data, e.g. for api testing: -Dxmage.scryfallEnableBulkData=false

Mage/src/main/java/mage/players/net/UserData.java

@@ -26,7 +26,7 @@ public class UserData implements Serializable {
     protected int autoTargetLevel;
     protected boolean useSameSettingsForReplacementEffects;
     protected boolean useFirstManaAbility = false;
-    private String userIdStr;
+    private String userIdStr; // TODO: delete as un-used or use for hardware id instead?
     protected Map<UUID, Set<UUID>> requestedHandPlayersList; // game -> players list
 
     protected String matchHistory;