Writing XSD for all API methods

[maul-esel]

The XSD for API output is currently incomplete. Missing files should be added.

API methods to write XSD for:

• [x] version

  items

• [x] items/add (HTTP 204)
• [x] items/list
• [x] items/tags
• [x] items/types
• [ ] items/describe
• [x] items/remove (obsolete, and HTTP 204 anyway)
• [x] items/rating

  review

• [x] items/review/accept (HTTP 204)
• [x] items/review/reject (HTTP 204)
• [ ] items/review/status

  stdlib

• [x] stdlib/items

  candidates

• [x] stdlib/candidates/list
• [x] stdlib/candidates/approve (HTTP 204)
• [ ] stdlib/candidates/describe
• [ ] stdlib/candidates/create
• [x] stdlib/candidates/reject (HTTP 204)
• [x] stdlib/candidates/accept (HTTP 204)
• [ ] stdlib/candidates/voting

  pending

• [ ] stdlib/pending/list
• [x] stdlib/pending/delay (HTTP 204)
• [x] stdlib/pending/edit (HTTP 204)

  releases

• [x] stdlib/releases/list
• [x] stdlib/releases/create
• [ ] stdlib/releases/describe
• [x] stdlib/releases/delete (HTTP 204)
• [x] stdlib/releases/modify (HTTP 204)
• [x] stdlib/releases/publish (HTTP 204)

  users

• [x] users/list
• [ ] users/describe
• [x] users/modify (HTTP 204)
• [x] users/authorize (HTTP 204)
• [x] users/unauthorize (HTTP 204)

  registration

• [x] users/registration/init (HTTP 204)
• [x] users/registration/token (Outputs image)
• [x] users/registration/verify (HTTP 204)

  suspensions

• [x] users/suspensions/list
• [x] users/suspensions/create (HTTP 204)
• [x] users/suspensions/delete (HTTP 204)

[maul-esel]

Also: add special XSD type for semver (see schema.xsd).

[maul-esel]

Required for #35.