getting rid of oc_files_map

[DeepDiver1975]

we better move the physical path column into the cache table - kind of related to #12460

[PVince81]

CC @nickvergessen

[nickvergessen]

I think this is a nice idea, the "mapper" can still take care of this, the only thing that changes is, where it looks up the file.
However I think the transition needs to be tested carefully. Also once the table is deleted on trying an update there is no way back.

[PVince81]

8.1, 8.2 or backlog ? 😄

[nickvergessen]

8.1 needs a decision on this

[karlitschek]

Yes. We should move this into the cache table directly.

[PVince81]

What to do with this ? Defer or obsolete ?

[nickvergessen]

We will do that once we remove all the other windows hacks