[Idea] Request/update collection properties at beginning of sync

[sunkup]

Currently collection properties like "read-only" and "display name", for example, are only fetched in service detection.

This means that the "read-only" flag is sometimes not up to date / wrong when we sync. So the sync might run and try to do an upload although the collection is read-only.

To prevent this we could fetch the read-only state and other properties at the start of every sync. This could be added to the already existing sync conditions check (correct network, etc).