Automatically take up available column width based on main window size

[YokoZar]

When I resize the springlobby main window, currently it leaves the size of the available games columns unchanged, leaving a lot of wasted space.

I suggest automatically resizing the two columns that are most likely to be important when we do this - namely, the game description, the map name, and the player names column.

For bonus points, you can prioritize expansion based on which one still is cutting off text.

[liquitsnake@…]

Actually, I would prefer Ticket 98 over this.