Make a 2v2 layout

[timotheeg]

Example of 2v2:

• CTWC: 2x2 grid, one match on top, one match below
• WPL: side by side matches

What's needed:

• Dual competition layout (simple_1p or compact), side by side or quad (maybe make 2 layouts!)
• Ability to maximize just one match to fill the entire layout, and back to 2v2 view to start next round

Bonus: Make the layouts video compatible where the video feed automatically grows and shrink based on whether the display is in 2v2 mode or single match focus mode.

Need to customize the setWinner() API, such that it applies to the matches individually.

[timotheeg]

This is done with the layout ctm_2matches 🎉