[FR] Add button for "Remove Team" in battle room

[Teteros]

A button under 'Add Team' or beside team name which removes a specific team would be more intuitive that current implementation which removes the last team only when there is no more players in that team.

Demo: https://streamable.com/ntz0b

[gajop]

So to revive this issue:

1. I don't think teams should be automatically managed by the lobby in Skirmish. That leads to weird behavior as shown in that screenshot. Letting users manually add/remove teams seems like the best idea. Teams could be removed by pressing on an [X] button similar to how chat channels work

2. In MP it's a bit more complicated because server doesn't hold team information. Furthermore, there is also automatic balancing going on, and other people changing teams on their own, so we need to clear out the empty teams, or they will flood the battle.

But, maybe we should change how we think about this, and consider that we actually aren't managing teams. We want users to be able to join a new team or add AIs to a new team, not to add teams, as that doesn't mean anything.
Those two actions could be represented by:
a) Having a "Add AI"->{Team 1, Team 2, ... Team n, New team} combobox (same with "Join"), or
b) by having a single line at the bottom of the teams that has a different color and content like "New Team [Add AI] [Join]" buttons, with join invisible if you are the only person in your current team.

I think I would prefer option b), as comboboxes aren't great for navigation in my experience. Also, having the "New team" line at the bottom makes more sense regarding the layout (it's logically next to other team/AI management options). Either way, there would be no need to manually manage teams, and the "Add Team" button can be removed.

I think I will implement option b) and ask for further comment.