Reworking effects which allow casting spells from a selection of cards (ready for review) (#8136)

* added function for casting spells with specific attributes from a selection of cards

* updated cascade to use new method

* refactored various cards to use new methods

* added TestPlayer method

* fixed a small error

* text fix

* broke out some repeated code

* added missing notTarget setting

* add additional retain zone check

* some more cards refactored

* more refactoring

* added interface for split/modal cards

* reworked spell casting methods

* reworked multiple cast to prevent unnecessary dialogs

* fixed test failures due to change in functionality

* add AI code

* small nonfunctional change

* reworked Kaya, the Inexorable

* added currently failing test

* added more tests

* updated Geode Golem implementation

* fixed adventure/cascade interaction, added/updated tests

* some nonfunctional refactoring

* added interface for subcards

* [AFC] Implemented Fevered Suspicion

* [AFC] Implemented Extract Brain

* [AFC] updated Arcane Endeavor implementation

* [C17] reworked implementation of Izzet Chemister

* [ZEN] reworked implemented of Chandra Ablaze

* additional merge fix

* [SLD] updated Eleven, the Mage

* [NEO] Implemented Discover the Impossible

* [NEO] Implemented The Dragon-Kami Reborn / Dragon-Kami's Egg

* [NEO] Implemented Invoke Calamity

* [AFR] Implemented Rod of Absorption

* [VOC] Implemented Spectral Arcanist

* [VOC] added additional printings

* [NEO] added all variants

* [SLD] updated implementation of Ken, Burning Brawler

Mage/src/main/java/mage/cards/SplitCardHalf.java

@@ -3,12 +3,8 @@ package mage.cards;
 /**
  * @author LevelX2
  */
-public interface SplitCardHalf extends Card {
+public interface SplitCardHalf extends SubCard<SplitCard> {
 
     @Override
     SplitCardHalf copy();
-
-    void setParentCard(SplitCard card);
-
-    SplitCard getParentCard();
 }