Rewrite OAR saving and map generation. 🔼

The reason I restart the grids weekly is coz the automated backups and map generation leak memory badly.  Moving them to a separate process that goes away when finished seems like a sane idea.

They both scan through everything on the sim to do their work, so could combine them into a single scan.

I could even combine this with the gitAR code.

Do everything at once rather than lots of duplicated effort.

Then add IARs to, since most of the hard work is done.

reported=2021-05-28 05:53:18

reporter=onefang

priority=normal

category=TODO

severity=major

resolution=open

2021-06-01 11:34:05 onefang: While doing the gitAR thing, I could likely spot if anything actually changed before deciding to generate the map.

2021-06-30 15:07:43 onefang: Also deep within the bowels of IAR saving, don't save the system Trash folder.  Might save some space.