[backport#13537] GUI: Peer table: Visualize inbound/outbound state for every row
Summary:
4132ad3bf Show symbol for inbound/outbound in peer table (wodry)
Pull request description:
Fixes #13483 The address in the network peer table is prefixed with an up-arrow symbolizing an outbound connection, or an down-array symbolizing an inbound connection. See screenshot. The user has an easy visual confirmation about the connection direction state. I really like it :) Impact to columns sorting is grouping by inbound/outbound first, which in my opinion is an advantage, too. 
Backport of Core PR13537
Test Plan:
ninja all ./qt/bitcoin-qt -testnet
enter "Peers" window and look for arrows
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Subscribers: deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D8543