control: account, notification and organisation screens (CLI views stage 3b) !557

Stage 3b of #316, Ref #319. Stacked on !556.

• Account: keys, email, pgp, token and web sessions lists; whoami; emitProfile (profile show, profile set, org profile).
• Notifications and webhooks: notifications list, the settings emitter (show/mail/reply/watch/push), device list, webhook list and deliveries. Webhook URLs on screen are scheme and host only; piped output unchanged.
• Organisations: org list, org show (and members list), one label screen for repo and org label lists, emitMilestones taking its caller's legend, org team list and show.
• Test fixtures set Limits.WriteRate = -1: the write limiter is global to the package and the fixtures' writes as user 1 pushed TestStatusSetRefusesReservedContext over it.