* explicitly ignore errors where appropriate
* do not append in a loop
* specify format string in Errorf

This allows to not use the internal game state directly from client
code.

* fix a lot of target and action bugs
* check target selection before adding it to the prompt
* use the store view for stores on the map
* fix card highlighting in CardGrid
* Only prompt for Upkeep-/DiscardActions if appropriate
* Add helper for areaEffects granting new FullActions
* Add Target() helper selecting the first target to the Action interface
* Fix BuyAction and DiscardAction targets
* Remember the stores a player has seen

* implement most of the kraken cards
* unify permanent marks
* add state based actions hook for card implementations