Fully dynamic, handling of deployment mode, multiple applications and subscriptions.

[UPDATED]   More generic productID-to-level mapping.
[ADDED]     Handle sandbox mode.
[UPDATED]   Make sure column for receiptB64 is large enough.
[ADDED]     User's active love level and number of active subscriptions.
[UPDATED]   More guicy receipt service.
[ADDED]     Receipt parsing and validation.
[ADDED]     Support receipts from various applications.
[ADDED]     Log configuration.