WIP implement autorelock policy for kbd slide

on open slide:
  clear autorelock
  if display off and proximity not covered:
    unblank
    remove tklock
    set autorelock on kbd slide

close slide:
  if autorelock on slide close:
    set tklock
    blank
  clear autorelock

on display off:
  clear autorelock

on handling call:
  clear autorelock

on touch activity:
  clear autorelock
WIP initial switch state probing must take evdev mapping into account
WIP clarify keyboard_slide_pipe initialization