Add a 'vote'-button to Card

Like here on KanBoZone we would love to have the ability to vote/weight/like a card within our team-, project- and asset-boards.

Enabling voting on a board, the votes total could be used to sort cards in a list (e.g. most votes on top).

The possibility to filter a board for cards with votes only (e.g. = prio/focus)  would be the climax then…

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