[MERGED PR] Merges mechanics with engineer

[Conchuckter]

The RKIT is a definite overlap between the two jobs, so moving it to something like a shared construction room wouldn't be a horrible idea. The ABC-U could also be included here along with other building supplies.

See https://github.com/goonstation/goonstation/pull/3838 for reasons why that wouldnt be great, itd run into all the challenges that this pr may bring about, with none of the upside. 

Personally, even if mechcomp and packets had enough content to be enough for a full fledged job and didnt run into the issue it runs into now where most of the stuff you can do with it is miscreant tier (which wouldnt be nearly as much of an issue if a job wasnt forced to focus on it if they wanted to actually do something), I still wouldn't support a job just for that. I'd much prefer if interacting with packets was something that was spread out (even if indirectly for most jobs), instead of one sole job for it.

Your statement of this solution having "none of the upside" is a massive overstatement, many people have brung up that the main reason they don't do building projects is their lack of access to the RKIT, and this is also one of reason's many people break into MechLab. Also "itd run into all the challenges that this pr may bring about" is just incorrect, at most it could bring one of the three being: "The surplus of people with access to the rkit will make it much harder for security to track people who print out batons and other bad stuff." Which as you've outlined could be easily fixed by adding some simple logging.

At the end of the day even if you made packets wide spread (which they practically are already, anyone can do packets) the main users would still be Mechanics, as the job congregates people who want to work on niche features while still preforming a job. Making the uses of packets aid the station greater would give Mechanics even more purpose and would work to remove their stigma of being only used for harming the round.