fix: InvoicePaymentMethod field types

fix: BTCPay-Sig check

feat: InvoiceEvent.Rate

fix: update InvoicePaymentMethod fields

feat: StatusDaemon

refactor: Store methods don't need pointer receiver

refactor: remove DummyStore, remove Store interface, rename ServerSto…

…re => Store

refactor: rename Load => LoadConfig
refactor: rename ProcessWebhook => ParseInvoiceWebhook
refactor: merge InvoiceCheckoutLinkPreferOnion => InvoiceCheckoutLink

test: remove test which needed a BTCPay server instance

docs: 3-BSD license
docs: zero Store struct behavior

chose: update type ServerStatus

fix: add missing import

fix: workaround: add missing SyncStatus fields for Monero

fix: update ServerInfo SyncStatus API

docs: Readme: bitpay