1.6.4
### Improvement:
* If a webhook is the loopback address, skip SSL verification @Kukks
### Bug fixes:
* Minor checkout UI fix (#4015) @dennisreimann
* Greenfield: Update webhook would reset the secret (#4010) @Kukks
* Fix crash when BTC network isn't available (#4007) @Kukks
* Make InvoicePaymentSettled return correct afterExpiration value (#3966) @Kukks
* Greenfield: Allow tagging a transaction even if it hasn't been yet broadcasted @Kukks
### Improvements:
* The invoice filter dropdown list labels should be "Settled invoice" rather than "Paid invoice" (#4000 #3573) @BitcoinABee