Port to wlroots 0.16

[gwimm]

bruh. buffet, have you heard?
i've heard.
and i beleave you haven't.
truly, surfaces don't exist anymore..
what do you think o; that?
if you do beleave me, do tell.
what's your on Ion on that.
also pointers are funny now.
there's_also no_more output_names in_things.
let me tell you trulie here.

bitrot.

BITROT, oh noo!!!!!!
oh NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
what terrible accident has come before us, what great tragedy we couldn't predict

what do we do?

here's the port.

also; pin your wlroots version if you can.

[gwimm]

Oh, the reason evaluating flake.nix fails, is because there is no flake.nix