Create and delete resource class

[kilchenmann]

https://dasch.myjetbrains.com/youtrack/issue/DSP-427

Two new methods to create and delete resource classes.
Needs knora-api v13.0.0-rc.11

The e2e test can be reproduced in test-framework; open console to see responses:

• Click on Login
• Optional: Click on Get anything project ontologies → Anything project should have 3 ontologies
• Click on Create testonto → Will add a test onto to anything project
• Optional: Click on Get anything project ontologies → Anything project should now have 4 ontologies
• Click on Get testonto → Test onto doesn't have a class
• Click on Create resource class → Will add resource class to test onto
• Click on Get testonto → Test onto should have a test res class
• Click on Delete resource class
• Click on Get testonto → Test onto doesn't have a class anymore
• Click on Delete testonto
• Optional: Click on Get anything project ontologies → Anything project should again have 3 ontologies

[flavens]

LGTM, tests and the test app work
In the code, some imports should be cleaned up and alphabetised.

[kilchenmann]

In the code, some imports should be cleaned up and alphabetised.

Done in 353dcb4 and 0e6c389

[mdelez]

LGTM! I went through the steps outlined in the PR description and everything worked

[kilchenmann]

@flavens @mdelez I had to update some small details. Tobias asked for these changes. They are all part of 112115e. Can you take a second look?

[mdelez]

@flavens @mdelez I had to update some small details. Tobias asked for these changes. They are all part of 112115e. Can you take a second look?

Everything still works for me :) My approval is still valid