Tracker: Arcade safe #10

Track the arcade safe filling up.

Scope

• Data (decision 004): the payout per interval (it depends on the number of arcade machines owned), the interval (in-game day, so play time), the safe cap and any condition (e.g. the casino heist must be completed), all sourced.
• Settings (Settings: owned properties and upgrades #5): number of machines (or whatever the payout depends on).
• UI: the safe amount, time until it's full and a "Collected" button. Resyncable (Core: resync any tracked value by hand #4).

Should share a generic "safe" model with #8 (nightclub safe) and #11 (Money Fronts) if they end up alike. Depends on #1, #2, #4.