New Board type to be used in retrospectives

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Is your feature request related to a problem? Please describe.
This is a request for a new board (type). One that can be used during retrospectives.

Describe the solution you'd like

• At the beginning of a retrospective the board shows some empty columns.
  • The columns represent a subject to be discussed/reviewed. Like, 'What did you like', 'What didn't you like' and 'Try next', etc
  • The columns are created by someone, or can be selected from a default set
• Participants can add cards to the respective columns.
• My cards are visible, while cards added by others (in the same session) are not visible yet.
• After some countdown time, all cards are shown
• While reviewing/discussing the topics on the cards - similar cards can be merged into one card

Next:

• Topics can be voted for, with a thumbs up
• After voting 'someone' can order the cards. The cards with the highest votes are stored at the top.

Next:
Add a new column (when it is not available), for example called 'Action':

• Move the highest scored cards from the other columns to the Action column
• Allow for additional text to be added to the Actions card.

People now know what to do. Quick and easy :)

The cards in one column should have the same background color. Green, Purple, Orange, for example.

Many more things can be envisioned. But with the above functionality to start with, it would be nice board already.

Describe alternatives you've considered
easy retro

Additional context
See previous item, for examples.

The issue names no files, tests, or entry points. Start by locating the existing board implementation and scoping which retrospective behaviors belong in an initial release; define acceptance criteria for columns, private cards, reveal timing, merging, voting, ordering, and action cards before implementation begins.