Boards: Change or delete the board owner

[#1]

We would like to be able to change or delete the owner of a board. This feature is especially important be cause of the joiner/changer/leaver process. Once a person leaves a team or the company a board needs to be reassigned. Currently the board owner cannot be removed or changed. Thus, this person will remain to have access to the board (if not deactivated or deleted), or even when deactivated show up as the owner of a board.

The workaround would be to move all cards individually to a new/different board, as there is no bulk move feature, yet.