`CardState::setAttachedTo` is not clang-format clean on master, so a
full-tree `./format.sh --test --branch ""` fails. Formatting only, no
behavior change.
* [Refactor] Move game logic into libcockatrice_game
* [Refactor] Include card_state.h in player_actions.h
* [Game] Inject settings providers into libcockatrice_game, drop Widgets
* [Game] Follow base rename to createCardRequested after rebase
* [Game] Drop unused CardItem forward declaration
* [Game] Fix includes after moving game logic into libcockatrice_game
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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>