* implement draft/pre-away
* clean up some subtleties in auto-away aggregation.
* consistently apply auto-away only to always-on
* `AWAY *` should not produce user-visible changes wherever possible
See 69448b13a1 / #1969; the compiler can now ensure that a uint64
intended for atomic access is always aligned to a 64-bit boundary.
Convert atomic operations on uint32s and pointers as well.
AWAY status should be tracked per-session:
1. With auto-away enabled, away status is aggregated across sessions
(if any session is not away, the client is not away, else use
the away status that was set most recently)
2. With auto-away disabled, we get the legacy behavior where AWAY
applies directly to the client
checkAlwaysOnExpirationNoMutex was respecting registered status, but
always-on clients were not considered registered at the time of the
initial check, so they were being created regardless of expiration.
Store the channel-user modes of always-on clients along with their
channel memberships, restore them on server startup. This will coexist
alongside /CS AMODE, which autoapplies modes to clients on join regardless
of their always-on status.
CLIENTS LIST shows information about clients attached to a nick.
CLIENTS LOGOUT allows individual (or all) sessions to be logged out.
SESSIONS is now an alias for CLIENTS LIST.
Fixes #1072.
fix an edge case with `/NS SASET user always-on true`
If force-nick-equals-account is disabled, then this could cause
a client with a non-reserved (or grouped) nick to become always-on.
(This can't happen with `/NS SET always-on true` because we check in
advance.)
Explicit quit and ping timeout behave the same way,
but reattach after abandoning/losing the previous session
(without the break being detected server-side) is more aggressive
about replaying missed messages, at the cost of potential duplication.