* new feature: Emblem Cards
Allows match/tournament creator to specify cards to give each player
emblem versions of (or just the starting player for symmetric effects).
Technical details:
- new UI for specifying emblem cards (.dck files)
- available for all match/tournament types
- new class `EmblemOfCard`
- new method `copyWithZone` on `AbilityImpl` (used to make abilities
work from command zone)
- new fields on `GameOptions` and `MatchOptions` for emblem cards
- emblems are granted after mulligans, before first turn (technically
after Planechase starting plane creation)
* fixes
* defaults for emblem cards in match options (fixes quick game buttons)
* minor fixes
* use DeckCardInfo instead of Card for emblem cards options
* restore accessible parent properties
* fix images for card emblems
* look up cards in a way that preserves which art
* fix typos; make Emblem.sourceObject protected
* add descriptions to planechase and emblem cards
* fixes
* add some unit tests for known working cards
* fix author name
* add explanation comment
* fix up tests
* copyWithZone: no longer modifies zone for singleton abilities
* directly check for MageSingleton
- fixed that copy effect doesn't restore original image after effect's end;
- removed outdated availableImageSetCodes (all images auto-selected from tokens database now, related to #10139);
- refactor command objects to use CommandObjectImpl;
- refactor planes/emblems/etc objects to use MageObjectImpl, added copyable support;
- refactor another game objects to remove some duplicated fields;
