get rid of getLabelFromData in Basic renderers

This is all just-in-case code. There should be more renderer subclasses that grab the exact piece of data. getLabelFromData is better suited for Express.

Start by locating getLabelFromData and the Basic renderer subclasses. Read how those renderers obtain label data and compare that with the Express usage mentioned in the issue. Done means the unnecessary Basic-renderer helper is removed and the affected subclasses obtain their exact data directly, with relevant renderer tests still passing.

Written by the indexing model from the issue text.