Delete entities related to physical objects

See saref-portal#52 (closed)

• Class s4envi:PhysicalObject, aligned with the DUL top-level ontology.
• Class s4bldg:PhysicalObject, aligned with the DUL top-level ontology. Exact same definition as in SAREF4ENVI, but different axiomatization: s4envi:PhysicalObject ⊑ ∀ s4envi:isContainedIn . s4envi:PhysicalObject, while s4bldg:PhysicalObject ⊑ ∀ s4bldg:isContainedIn. (s4bldg:PhysicalObject ⊔ s4bldg:BuildingSpace)
• SAREF4INMA reuses s4bldg:PhysicalObject
• OP s4bldg:contains has a different definition than s4envi:contains.
• OP s4bldg:isContainedIn has a different definition than s4envi:isContainedIn.

Decision made in ETSI TS 103 264 V3.2.1:

1. An instance may be classified as both saref:FeatureOfInterest and geo:SpatialObject.
2. The class saref:Device is a sub-class of geo:Feature from the GeoSPARQL standard [8, section 6.2].

In SAREF4ENVI: delete s4envi:PhysicalObject, s4envi:contains, s4envi:isContainedIn