some adjustments to function arguments. might or might not make sense. they kinda represent the types used by bitcoind internally but bitcoind casts everything it receives to int64 anyway.
BtcTransactionInfo window shows info about raw tx in/outputs and you can select double spends in the combo box to display their info
enabled zmq4 code
just some GUI adjustments
added helper function to get confirmed/pending/watchonly balances and solved linker issue with btc::to_string"
added balance fields go GUI
using btc::to_string again
switched to zmq2
imporoved BtcHelper
various improvements
headers missing in repo code. delete this commit, it is already fixed in ot/develop