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Also in this commit:

- Moved logic from `useEntityViewerIds` to the dedicated EntityViewerIdsContext (similar to the one on the
  Genome Browser page). `useEntityViewerIds` now just reads from this context and makes it available to
   components
- Minor updates to graphqlBaseQuery function, to include more information in the errors
  (similar to @rtk-query/graphql-request-base-query)

The commit includes several modifications of the `DataTable` component:

- `TableCellData` type is changed to include not only React nodes, but also arbitrary structured data
- A custom renderer can be provided to a column for displaying the structured data on screen
- Another renderer can be provided to a column for transforming the structured data into strings
  to include in an exported file
- A custom sorting function can be provided for a column whose content is structured data.
   In absence of such sorting function, the default sorter will assume that the data in table cells is either strings,
   or numbers, and sort the rows accordingly.

Also, showing the placeholder (as selected but disabled) in the options dropdown, do avoid the confusing browser
behaviour resulting from hiding the placeholder option — when the browser shows the first option as  selected,
although it hasn't been.

Also:
- Exclude Opera Mini from the list of supported browsers
- Set minor version of corejs in babel config