Hopefully later we can use NPM for them, first want to get things to work

Initial work on adding OMEMO support

updates #1094

Otherwise subtle, hard-to-reproduce bugs happen while testing.

Also, don't unnecessarily call `delegateEvents`, it also causes
heisen-breakage.

So that we can cache roster data for longer and presence data for
shorter.

after sending

Also remove the `message_storage` setting.

Instead of padding the container, pad individual elements that need it.
This enables us to have highlighting (e.g. on hover) that spans the full
width of the controlbox.

updates #1069

in the overlayed view_mode

* Translated using Weblate (Dutch)

Currently translated at 100.0% (313 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/nl/

* Translated using Weblate (Flemish)

Currently translated at 100.0% (313 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/nl_BE/

* Translated using Weblate (Japanese)

Currently translated at 100.0% (313 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/ja/

* Translated using Weblate (Hungarian)

Currently translated at 100.0% (313 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/hu/

* Translated using Weblate (Norwegian Bokmål)

Currently translated at 84.9% (266 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/nb/

* Translated using Weblate (French)

Currently translated at 99.0% (310 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/fr/

* Translated using Weblate (Arabic)

Currently translated at 79.2% (248 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/ar/

* Translated using Weblate (Arabic)

Currently translated at 86.5% (271 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/ar/

* Translated using Weblate (Indonesian)

Currently translated at 27.4% (86 of 313 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/id/

instead of informing all users every time someone enters the room.

so rename model and only use it in the VCards collection.