* BitcoinSpecificBtcPayNetwork - abstract BTCPayNetwork
* some type fixes
* fix tests
* simplify fetching handler in invoice controller
* rename network base and bitcoin classes
* abstract serializer to network level
* fix serializer when network not provided
* fix serializer when network not provided
* fix serializer when network not provided
* try fixes for isolating pull request
* Make wallet able to send to multiple destinations
* fix tests
* update e2e tests
* fix e2e part 2
* make headless again
* pr changes
* make wallet look exactly as old one when only 1 dest