Accounts for G4 Pxxx
  Accounts for Z moves as well.
  Also prints out duration for each layer while calculating the total time.

  Does not use individual axis acceleration, only uses sprinter default acceleration 1500.0 mm/s/s
  Does not count E for timing... so if E is slowing down the move, we're not accounting for that.

** fixed: 2x distance to reach full speed, because accel and decel to 0.0 at each move.

TODO:
  Get Device Caps (per axis acceleration, per axis speed limits)
  anything else...?