Roadmap

Short term

aux/util: Add mutex and threading wrappers.
aux/math: Add kalman filter math black box.
aux/log: Add a common logging framework that can be used to pipe messages up into st/oxr from things like drivers and the compositor.
aux/log: Make it possible to batch up longer messages into a single call, useful for printing the entire mode list in a single go.
cmake: Make a proper FindXCB.cmake file.
comp: Do timing based of the display refresh-rate and display time.
comp: Extend to support rotated views/displays. Should we just rotate the display for the 3Glasses or make it a per-view thing?
comp: See-through support for Vive headset.
st/oxr: Locking, maybe we just have a single lock for the session. We will need to figure out how to do wait properly.
st/oxr: Make wait frame actually wait for the display time.
st/oxr: Improve space functions.
st/oxr: Add path functions.
st/oxr: Add just enough of the action functions to not return errors.