As a user, I can import Pre-Conditions and Tests as the same time using the Test Case Importer

As a user, I can import Pre-Conditions and Tests as the same time using the Test Case Importer.

For this, in the CSV file format must be changed:

• for a Test related row, a new column can be specified containing an internal id of some Pre-Condition defined in another row
• a column must be used in order to identify the issue type (e.g. Test, Pre-Condition)
• Pre-Condition related fields must be mappable, including
  • Pre-Condition Type
  • Pre-Condition Condition
  • internal id, so it can be referred by other Tests imported at the same time

Note that Pre-Conditions should be specified as the first rows, so they can be created first.