Language code to human friendly name translation is now done with the
help of the ICU library. It works if the line
```
-include $(LANGSRCDIR)/resfiles.mk
```
in the file `source/data/Makefile.in` of the icu4c dependency is not
commented out. Currently, the said line is commented out (along with
some other include's) by the `icu4c_custom_data.patch` patch of the
`kiwix-build` tool.
Introduces a new member mp_search that houses the zim::Search object,
adds a new constructor for this purpose. This commit also add an
overload for getHtml that takes start and end integers as arguments
since they are not part of the search object we include.
With openzim/libzim#540 we now have a new function to get
illustration(previously favicon in 48x48 size and unity scale) in
multiple sizes. We need to replace getFaviconEntry with this new
getIllustrationItem method.
This changes the output of `/catalog/search` as follows:
- Entire search query (rather than only the value of the `q` parameter)
is put in the <title> node.
- Search performed with an empty query presents itself as "All zims".
- The feed id remains stable for identical searches on the same
library.
/catalog/v2/entries is intended to play the combined role of
/catalog/root.xml and /catalog/search of the old OPDS API. Currently,
the latter role is not yet implemented.
Implementation note: instead of tweaking and reusing
`OPDSDumper::dumpOPDSFeed()`, the generation of the OPDS feed is done via `mustache`
and a new template `static/catalog_v2_entries.xml`.
Note: This commit somewhat relaxes validation of non variable
`<updated>` elements in the OPDS feed - the contents of any `<updated>`
element is replaced with the YYYY-MM-DDThh:mm:ssZ placeholder.
Each sugestions used to be stored as vector of strings to hold various values
such as title, path etc inside them. With this commit, we use the new
dedicated class `SuggestionItem` to do the same.
