Unity security patch added

Updated Billing Library (IAP In-App Purchasing).

- Bug fix: Cards 41 & 42 (Quicksand) first effect was unavailable when second effect was available.
- Translation correction.

Bug fix: Game freeze after undo in rare cases.
Translation and text improvements.
Other minor improvements.

New features requested by the community:
- Added option to show/hide game restore preview.
- Added option to automatically confirm messages about acquired resources.
- Only the better effect is shown when the player has to choose the effect of a given card.
- Added highlight animation of the card green checkmark (card activation button).
- Application now prevents device from entering the sleep mode during the game.

Minor corrections in the English translation.

Minor improvements.