Added 'get_payments_count()' and 'get_transfers_count()
Switched back to raw copy for 'get_all_payments()', for pseudo-thread-safe iterations
Stupidness fixed.
Stupidness fixed.
Added cache to 'MoneroWallet' wrapper
Added block height in 'on_payment_received' for consistency
Added 'on_skipped_transaction' to observer
Added remaining methods to observer (not definitive)