mod_sasl2_bind2: Add explicit dependency on mod_sasl2
Ensures mod_sasl2 is installed and loaded so it can fire the relevant
events.
# mod_muc_batched_probe
This module allows you to probe the presences of multiple MUC occupants or members.
XEP-0045 makes provision for MUC presence probes, which allows an entity to
probe for the presence information of a MUC occupant (or offline member).
See here: https://xmpp.org/extensions/xep-0045.html#bizrules-presence
This module creates the possibility to probe with a single IQ stanza the
presence information of multiple JIDs, instead of having to send out a presence
probe stanza per JID.
The IQ stanza needs to look as follows:
```
<iq from="hag66@shakespeare.lit/pda"
id="zb8q41f4"
to="chat.shakespeare.lit"
type="get">
<query xmlns="http://jabber.org/protocol/muc#user">
<item jid="hecate@shakespeare.lit"/>
<item jid="crone1@shakespeare.lit"/>
<item jid="wiccarocks@shakespeare.lit"/>
<item jid="hag66@shakespeare.lit"/>
</query>
</iq>
```
## Configuration
Under your MUC component, add `muc_batched_probe` to `modules_enabled`
```
Component "conference.example.org" "muc"
modules_enabled = {
"muc_batched_probe";
}
```
## Client Support
Converse.js has a plugin which supports this feature.
https://www.npmjs.com/package/@converse-plugins/muc-presence-probe