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

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Currently translated at 84.9% (266 of 313 strings)

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* Translated using Weblate (Arabic)

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

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

Include entity capabilities hash in outgoing presences

Also, started some work on using jsdoc for rendering API documentation.
Ideally that would go into a separate commit but that would take ages to
untangle.

- For roster contacts, only show remove icons on hover.
- Show light background color when hovering over an item in the
controlbox.

Ideally this background color will be 100% of the controlbox width, but
I'm not opening that can of worms now...