Convert 'buy whole app' to 'buy all puzzles'
Add Stars to the main menu.
Dialog 'buy stars'
Purchase Pane: buttons
Purchase Pane: resources.
improve the stars dialog.
Stars: introductory dialog explaining the concept of stars.
Beginnings of support for 'Overlays': first overlay will be the rotating star which little stars fly to when one solves a level for the first time.
IAP part 5: new 'Purchase' activity (cont'd)
Make error reporting in the Solver a bit better.
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