Due to the potential changes in the ItemCollections (see https://github.com/radiantearth/stac-api-spec/issues/141) and also due to the fact that it's not really part of the core spec, removed the ItemCollection from the Stac "detection" heuristic.
PR Checklist:
[x] This PR is made against the dev branch (all proposed changes except releases should be against dev, not master).
[x] This PR has no breaking changes.
[ ] I have added my changes to the CHANGELOGor a CHANGELOG entry is not required.
[ ] This PR affects the STAC API spec,
and I have opened issue/PR #XXX to track the change.
Related Issue(s): https://github.com/radiantearth/stac-api-spec/issues/141
Proposed Changes:
PR Checklist: