story #7174: Display card semantic fields

Change-Id: I9258268a33827077994169c2ee20646a1e60f62b
story #7174: GET OPTIONS /backlog_items/:id

Change-Id: Ie52f9923910460f0970002a9caf22726878c837a
story #7174: On dropped event, update BacklogItem fields (auto-computed fields...)

Change-Id: I6feca7df3d49978c599149b834441acda32fcc4c
Merge commit 'refs/changes/75/3375/4' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7174: On dropped event, update BacklogItem fields (auto-computed fields...)
  story #7174: GET OPTIONS /backlog_items/:id
  story #7174: Display card semantic fields
This is Tuleap 7.8.99.18

Change-Id: I002fc75c88dfce514b2e6f3453020c0a53ea1620