Support joypad graphic overlay

[Nockm]

The client displays the raw hitbox graphic, which is not aesthetically pleasing; it should display something nice instead.

[electronstudio]

If you approve of the layout in 9803b76 we can proceed to draw something nicer on top of that layout.

[Nockm]

Looks good. Your layout includes axis-based input; initial support has been added for that in 6c460b5.

[electronstudio]

i drew something in bf49f2e . it's not properly aligned or anything.

[Nockm]

Controller graphic is now displayed, instead of the hitbox in ffde766.