Engine room facelift

Attempts to balance the following aspects of the engine room:
* The ability to change waste canisters without entering the engine room, increasing the number of people who can work together to save the engine.
* Not running anything under reinforced walls
* Security

Blast doors on the west side are controlled by the nearby button which have access requirements.
There are pumps under said blast doors.
The bolts of the maintenance door in the engine room is controlled by the nearby button, also with access requirements.

There is no reduction in the number of doors you have to pass through if you wish to enter the engine room wearing a radiation suit, whether you go with the normal or maintenance route.

The current result, adjusted according to comments below: 
![Engine Room - Try 3](https://www.dropbox.com/s/mkgb64seujrp4l7/Engine%20MKIII.png?dl=1)