Implement window_role criteria token

[RyanDwyer]

Depends on swaywm/wlroots#1226

This is the last of the criteria tokens.

To test, I put this in my config then launched Firefox:

for_window [window_role="browser"] title_format "%title lolz"

[emersion]

Can you rebase so the build gets green?

[RyanDwyer]

Done. As part of the rebase I noticed the recent HAVE_XWAYLAND additions have caused some switch cases to flow into others unintentionally, so I've rearranged them.

[ddevault]

Thanks!