This adds a module API which allows a module to update a user's
presence state/status message. This is useful for controlling presence
from an external system.

To fully control presence from the module the presence.enabled config
parameter gains a new state of "untracked" which disables internal tracking
of presence changes via user actions, etc. Only updates from the module will
be persisted and sent down sync properly).

* Fix bug where a new writer advances their token too quickly

When starting a new writer (for e.g. persisting events), the
`MultiWriterIdGenerator` doesn't have a minimum token for it as there
are no rows matching that new writer in the DB.

This results in the the first stream ID it acquired being announced as
persisted *before* it actually finishes persisting, if another writer
gets and persists a subsequent stream ID. This is due to the logic of
setting the minimum persisted position to the minimum known position of
across all writers, and the new writer starts off not being considered.

* Fix sending out POSITIONs when our token advances without update

Broke in #14820

* For replication HTTP requests, only wait for minimal position

Fixes some broken formatting from the reStructuedText to Markdown
conversion and fixes some typos.

There's no reason to expose the full Python version over what is
frequently a public API.

There are no known bugs in the message retention code, but
it is possible that there still exists race conditions. Additional
fixes will be made as reported.

Co-authored-by: Eric Eastwood <erice@element.io>

Co-authored-by: Hanadi Tamimi <hanadi.tamimi@sdui.de>

 Also add restore of purge/shutdown rooms after a synapse restart.

Co-authored-by: Eric Eastwood <erice@matrix.org>
Co-authored-by: Erik Johnston <erikj@matrix.org>

Similar to OIDC, CAS providers can now disable registration such
that only existing users are able to login via SSO.

Add the ability to use `G` (GiB) and `T` (TiB) suffixes in configuration options that refer to numbers of bytes. (#16219)

* Add more suffixes to `parse_size`

* Newsfile

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

---------

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

Move support for application service query parameter authorization behind a configuration option (#16017)

Adds three new configuration variables:

* destination_min_retry_interval is identical to before (10mn).
* destination_retry_multiplier is now 2 instead of 5, the maximum value will
  be reached slower.
* destination_max_retry_interval is one day instead of (essentially) infinity.

Capping this will cause destinations to continue to be retried sometimes instead
of being lost forever. The previous value was 2 ^ 62 milliseconds.

Signed-off-by: Nils ANDRÉ-CHANG <nils@nilsand.re>