Moved PI timer logic to its own service. The implementation for room
owner changes has been removed for now.

A new service, repository and entity have been introduced to handle file
attachments to other entities. Attachments store meta data about the
file. The file upload is not yet implemented. It is planned to abstract
the storage handling to allow the support for different storage
solutions (local file system, database, cloud).

Additionally moved previously missed v2 entities to the v2 package.

Introduced content groups which replace question variants and support
sorting.

Limit logging for profile handling to WARN level for privacy reasons.

* Adjust stages to increase parallelization
* Run SonarQube at the end and adjust dependencies so it has all data
  available

GitLab can handle this w/o scripting by now.

Refactored deployment script to allow flexible deployments for different
hosts and environments.

Marius Renner authored 7 years ago and Daniel Gerhardt committed 6 years ago

Cast int to double before division to avoid truncation of the division
result. Changed corresponding test so that it fails with the old
implementation.

Cherry-picked and backported from GH-52.