Created a generic list formatting helper class for this, to align with
logic used on the search results endpoint and for easier future re-use
in a standardised way.
Also updated some class property types.
Added test to cover new books-contents results.
Related to #3734
Allows easy direct linking and usage of the HTML preview content
we show in the UI when viewing search results.
Note: preview_html content is a rough representation only, it does not
match exactly what was matched in the database-search-operation which
finds the results.
For #3096 and #3080
Updated the back button to be a proper link instead of a reference to
the last viewed URL since it could break if the last page was the
current one (On validation for example).
Includes test to cover.
Also applied some styleCI changes.
Fixes#2834
Is a little awkward, emulates a 'list' API endpoint but has unstable
paging and does not support filters/sort. This is detailed on the
endpoint though.
Made some updates to the docs system to better support parameters
and examples on GET requests.
Includes tests to cover.
For #909
