Port WebUI part of 0fb0037ca7 to glitch-soc

Mostly a port of 2ccef52a4f to glitch-soc

Port 20d1be18af to glitch-soc

Change inspired by 691107263c

Fix a regression introduced by 612b00d1bb

Port ed50c2393a to glitch-soc

Port 89c6d2bd6b to glitch-soc

Port 955d5d36e8 to the glitch-soc flavour

Port f6910fba02 to glitch-soc

Port d0d23b8f0a to glitch-soc

Port f2d9a3c239 to glitch-soc

This prepares for a third option that would restrict privacy to
privacyPreference(replyPrivacy, sideArmBasePrivacy)

Port front-end part of 20fefdb714 to glitch-soc

Port 30e1da7668 to glitch-soc

Port 1ca4e51eb3 to glitch-soc

Port 404c7702ec to glitch-soc

Port cfeb3beb4e to glitch-soc

Port cdb101340a to glitch-soc,
but without dropping support for regexp filters yet.

Port 64d7a63f18 to glitch-soc

Port c75493755f to glitch-soc