Engine remap, valves now show open/close state on examine.

You can now examine any valve to see if it is open or closed.

Remapped the engine to remove pressure regulator and make it more clear which port is for inserting and which is for gas removal. It also made the engine room incidentally more symmetrical and added space on the right for one more freezer. The injection and vent pipelines are now split in the middle with a single, simple digital valve.

Also straightened the wire that connects to the engine room SMES.

![Screenshot of the new engine](http://i.imgur.com/KVhM961.png)