closes #22, simplify modeling of confidence level on observations

Closes #22, #32, and #33

See merge request !24

simplify positions and points. Closes #27

Closes #27, #29, #23, #28, and #30

See merge request !18

closes #32: define criticalobject as a feature kind, with narrower kinds

See merge request !25

closes #33: defines Parking Spot as feature kind with narrower kinds

See merge request !26

# Conflicts:
#   ontology/saref4auto.ttl

closes #31: delete s4auto:hasDescriptionName

Closes #31

See merge request !23

Issue 23: define states for automation level

See merge request !22

closes #29, uses saref:hasIdentifier

See merge request !20

# Conflicts:
#   ontology/saref4auto.ttl

# Conflicts:
#   ontology/saref4auto.ttl

closes #26, deletes subclasses of unitofmeasure

Closes #26

See merge request !17

# Conflicts:
#   ontology/saref4auto.ttl

closes #25: define taxonomies of vehicles and vulnerable road users instead of hierarchies

Closes #25

See merge request !16

closes #28: rely more on saref:consistsOf

See merge request !19

simply reuse saref:consistsOf. Closes #21

Closes #21

See merge request !15

issue-16 changes.

Closes #16

See merge request !12

issue-17 changes: imports and metadata

See merge request !11

issue-12 changes.

Closes #12

See merge request !10

issue 13 changes.

See merge request !7

closes #9

Closes #9

See merge request !4

issue-8 changes

Closes #7

See merge request !3

closes #19 and #20

Closes #19 and #20

See merge request !14