Add support for the Reprise mechanic

[Ellios77]

Motivation

• Implement the Reprise mechanic so instant and sorcery cards can be exiled from the graveyard to add their effects to another spell while paying an additional reprise cost.
• Provide engine and UI hooks so cards and card scripts can detect and display reprised spells and enforce the one-card reprise limit.

Description

• Register a new costed keyword REPRISE with reminder text in Keyword.java and mark it as modifiable in CardUtil.java so text-changing effects work correctly.
• Add AbilityUtils.addRepriseEffect and AbilityUtils.addRepriseEffect(..., Card) to detect a single eligible graveyard card, append its subability to an instant/sorcery being cast, and add the exile + reprise cost to that spell.
• Expose reprised state on SpellAbility via reprisedCards, addReprisedCard(...), getReprisedCards() and isReprising() and make SpellAbilityProperty recognize Reprise/Reprising checks.
• Add a dedicated chooser API chooseCardForReprise to PlayerController and a human GUI implementation in PlayerControllerHuman that enforces selecting at most one card, and wire reprise selection into PlaySpellAbility so reprise is considered when casting.

Testing

• Ran git diff --check to validate local code style and simple errors, which reported no check failures.
• Attempted to compile with mvn -pl forge-game -am -DskipTests compile, but the build was blocked by Maven Central dependency resolution for the build extension org.apache.maven.wagon:wagon-ftp:3.5.3 in this environment, so a full compile could not be completed here.

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Codex Task