Xlib vs. XCB

[cebe]

We wanted to consider switching from Xlib to XCB, here is some input on that:
https://www.x.org/wiki/guide/xlib-and-xcb/

[GrayHatter]

Not consider, we defenetlly want to

[GrayHatter]

the first thing we should switch away from xlib to xcb are functions we don't check return values on. It'd be nearly drop in, without any need to do anything but confirm the param positions are the same.