BattleSisters' hands lagged behind the controllers (also with ovrp_hold_physics on or off). pose_debug=1 (new,
FrameBridge: per 5 s and per located space, the requested time minus the predicted display time) showed on the dev
Frame (SteamOS 0.4.5): XrTime runs 2.56 s ahead of CLOCK_MONOTONIC, the hand spaces were located at -2564 ms (the
monotonic "now" passed on as an XrTime: OVRPort's dispatcher converts XR_KHR_convert_timespec_time 1:1 and
FrameBridge's emulation is never asked) and the head at XrTime 0.1 s (~1450 xrLocateViews/xrLocateSpace per 5 s).
pose_time_fix (default off; suggested for Unity built-in OVRPlugin games): in xrLocateSpace(s)/xrLocateViews a time
nearer the monotonic clock than XrTime's "now" is moved by the offset measured at xrWaitFrame, one more than 0.5 s
before the display time goes to "now". Headless with it on: every far-past request moved, located times -9.8..0 ms
from the display time. Host unit test for the time rules; PLAYBOOK row.
