Fixed some minor indentation problems.
Added player_autonavResetSpeed function.
Changed abortion of Autonav when danger occurs to slowing down time.
Autonav no longer aborts when hails are recieved or weapons fired.
Keep time slowed down until shield is above damage threshold.
Fixed documentation comment for player_autonavShouldResetSpeed.
Don't shout to the player when slowing down because of danger.

Main reason: because of a recent commit, it would keep shouting
"Shield below damage threshold!", and that would look weird. The
messages aren't needed, anyway; the player can see what's going on
just fine themselves.
Updated text in the options menu.
Changed the "lock" slowdown to simple enemy presence.
Updated options menu
Fixed nebula slowing you down.
Removed speedup-based zooming.

I found that the camera zooming in and out as the camera got reset
when pirates were seen was nearly giving me a headache. Since the
zooming out really serves no purpose now, I simply removed it.
* Lua will error if mission is accepted twice.
* You can now configure where to save stuff with the editor instead of hardcoded relative paths.