Circular layout (like a item wheel)

[Youssef Danlos]

Hello shwdcat, I'd like to make a weapon wheel for my game like in Zelda: Twilight Princess or GTA V. For this, a new circular component for layout would be handy!

Sincerely, Zice

[Quetzy]

7ea0b57

Radial Layout is added in the above commit. You can see it in the Layout Examples screen, and check the .yui file for comments about how to use it.

Let me know if anything is lacking!