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by deleting fields from /sync responses as you emit them into events,
to avoid wasting RAM when parsing the enormous accumulated sync response
from indexeddb on launch

Create sentinel members on-demand

The tests inject messages with no sender, so for now let's maintain
behaviour as it was before.

Some more doc on how sentinels work

We only need sentinel members for things like the 'sender' field
of events, so we previously created sentinels for everyone in the
room, but a large number of them were never used.

Instead, create them on-demand and cache them.

so that we have push rules loaded into the client after doing
a cached sync (so that the client can assume that we do have
push rules, even if it was loaded from a cached sync).

These rules will be updated once `getPushRules` is completed
prior to the first networked sync.

Block on syncing from cache so that the sync token
has been set prior to incremental syncing.

* Fix NPE when loading sync from cache

* Allow a mode of operation without HS connection

Instead of blocking the first sync on getting the push rules and
filter, load sync data from disc.

When the client comes online, the push rules will be acquired and
a sync cycle started. This could be immediate if the client is
already online.

This could be a breaking change for clients that get push rules
before a successful sync has been done.

Use their name as we did before rather than 'Empty Room'

Fixes https://github.com/vector-im/riot-web/issues/6083

Migrate room encryption store to crypto store

add parameter to getIdentityServerUrl to strip the protocol for invites

Move Device Tracking Data to Crypto Store

use new getIdentityServerUrl param in inviteByThreePid

in localstorage and memory stores