Remove triggerupdate.php & add quiet option for CLI scanner

@DeepDiver1975 @PVince81 @icewind1991 I was digging through the file scan stuff and stumbled over triggerupdate.php, only later saw the junior jobs.

triggerupdate actually checks hasUpdated() before making the scan, so there is a difference in behavior between triggerupdate and `occ files:scan --path="foo/bar"`.

Anyway, leaving this here until someone decides what to do with it
From a UX pov it should be either absolute paths (`/icewind/files/Music`) or paths relative to the files dir (`/Music`)

My preference goes to the former