Implement card reference widget

[julien-nc]

closes #4018

This adds a reference widget for deck cards.
It also fixes the DeckIcon.vue component so it uses the current color by default (which fixes an issue with dark themes).

Such URLs will be handled by @nextcloud/vue-richtext: https://nextcloud.local/index.php/apps/deck/#/board/2/card/11

It is necessary to use Talk master to try this. ⚠️ Warning: to compile Talk master, make sure you are using Node v14.x and NPM v7.x

Then send a card link in Talk, the displayed message should be like this

vokoscreenNG-2022-09-06_18-12-48.mp4

Bonus question, where does the music come from?

[julien-nc]

I also fixed almost all eslint warnings and brought back eslint on compilation. Hope it's fine to do it in this branch. Necessary sooner or later IMO.

[julien-nc]

Nevermind the static analysis failure. I did just like https://github.com/juliushaertl/integration_youtube/blob/5867a872bc9d54fc85d07fcee412f2c7fb5ac547/lib/Reference/YoutubeReferenceProvider.php#L48
so this will most likely be fixed on in server.

[karlitschek]

this looks amazing. thank you

[AndyScherzinger]

Looks great! 💙

Can we get both, deck-beta and talk-beta versions shipping this on tech-preview soon? This would be screenshoted by Marketing, so the sooner the better @eneiluj @nickvergessen

[jancborchardt]

Very cool! :) Design details:

• If the card is left-aligned with the rest of the text it would look a bit nicer (we don’t center anything in there atm)
• I’d also left-align the board and column name

[julien-nc]

@jancborchardt @nickvergessen

Done