Pre-Alpha 0.17 update

Pre-Alpha 0.17 update

-Warning! We highly recommend that you start a new game save as
many things have been refactored.

-New Drone Helper! Targets Sand crabs
-Contracts update, new contract in the cave
-Conveyor fixes
-Elevator interaction fix - now automatic!
-Ship dumping fixes and new notifications
-Snake fixes
-Player can move along conveyor again
-Recycling and conveyor performance fixes
-Floating garbage improvements again
-Robot fixes, AI, etc
-UI fixes