US: Add InApp store

[jboi-github]

As a developer, I'd like to name consumables and non consumables.

• A list of all consumables and not yet purchased non-consumables
• When bought, reflect in (non-)consumables
• call to restore purchases
• A sublist of consumables, identified by their id's

The template should handle the full lifecycle including under age player.

[jboi-github]

The storyboard template adds:

• In settings a button to restore purchases
• In Store a full list of (non-)consumables to choose and buy + restore purchases
• In Offer a list of given consumables to choose and buy + a button to go to full store, replacing the offer-screen in view hierarchy