this moves a bunch of things that were being don after loop starts to
before so they don't interrupt framerate as well as launch a thread
that preloads file(s) - for now just edj theme files so stuff is
pre-cached by the time loop starts later so we don't stall s much
leading to smoother startup/fade in and better framerate. it's really
visible (especially on my rpi3).
this is not the correct way to use this function, and tiling should probably never call it. this is a function for (slowly) repositioning every client on the currently visible desktop while trying not to overlap. on failure, which occurs when clients cannot be placed without overlapping, it moves clients to 0,0.
fix T1310 because there is no i in team