long_jump() now uses an arrive_time var instead of sleeping the whole time.

Makes ETAs more accurate, allows the possibility of interrupting
long_jumps in the future.

Conflicts:
	code/modules/shuttles/shuttle.dm
Resets emergency shuttle authorization on arrival
Fixes the escape pod Nano UI

The MANUAL EJECT button was sending the wrong command. Also separated it
from the other buttons.
Improves the display of shuttle ETAs

Conflicts:
	code/controllers/emergency_shuttle_controller.dm