Remove deprecated and unused addons

The following "addons" are deprecated and unused. They will be removed from the master branch, and DEPRECATED.md files will be added.

If anyone wants to revive them in the future, they should re-start or fork from the 10.10 branch.

• nuxeo-activity
• nuxeo-agenda
• nuxeo-business-days-management
• nuxeo-core-binarymanager-sql
• nuxeo-http-client
• nuxeo-javaagent
• nuxeo-logs-viewer
• nuxeo-rating
• nuxeo-resources-compat
• nuxeo-review-workflows-dashboards
• nuxeo-session-inspector

Also:

• mark corresponding marketplace packages as deprecated (remove their code and add a README):
  • marketplace-agenda
  • marketplace-resources-compat
  • marketplace-review-workflows-dashboards
• remove these marketplace packages from marketplace.ini
• remove Jenkins jobs pertaining to them