gui: Show permissions instead of whitelisted

Summary:
Show detailed permissions instead of legacy "whitelisted" flag.
These are formatted with & in between just like services flags.
It reuses the "N/A" translation message if not.

This is a backport of core-gui#34

Test Plan:
ninja && src/qt/bitcoin-qt
Menu Window > Peers. Select a peer to see its permissions.

Reviewers: #bitcoin_abc, majcosta

Reviewed By: #bitcoin_abc, majcosta

Differential Revision: https://reviews.bitcoinabc.org/D10011