Collective-iconifiedcategory

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- Do not fail in `categorized-childs-infos` if current context does not have
the `categorized_elements` dict
[gbastien]

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- Use `category_uid` instead `category_id` as key for infos dict used by
`CategorizedChildInfosView`, indeed we may have different configurations
used on same container for different categorized elements and those
configurations may contain categories with same id
[gbastien]
- Do not break if icon used for iconified category contains special characters
[gbastien]

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- Use ajax to display the categorized childs informations
[gbastien]
- Display select2 widget larger and with no padding between options
so more options are displayed together
[gbastien]
- Added option `show_nothing=True` to the `categorized-childs` view
to be able to show/hide the 'Nothing' label when there is no categorized
content to display
[gbastien]

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- Do not fail in `utils.sort_categorized_elements` if a key is not found,
it can be the case when copy/pasting and new element use another
configuration
[gbastien]

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- Sort `categorized_elements` by alphabetical order into a category,
this way it can be directly displayed as it in the tooltipster
or in the tabview without having to sort elements again
[gbastien]
- Add method `IconifiedCategoryGroupAdapter.get_every_categories`
that gets every available categories. Mainly made to be overrided,
it is used in `utils.get_ordered_categories` to manage the fact
that a container could contain categorized elements using different
group of categories
[gbastien]
- Add a configlet to allow user to sort elements on title on the
categorized tab view
[mpeeters]
- Ensure that categorized elements are sorted by group folder order
[mpeeters]
- Refactoring of iconified JavaScript functions
[mpeeters]
- Increase speed that show the categorized elements in the tooltipster.
[gbastien]
- Do not fail to remove the Plone Site if categories or subcategorie exist.
[gbastien]

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- Changed icon used with link to `More infos`.
[gbastien]
- Do not fail if subcategory title contains special characters.
[gbastien]
- Turn icon `more_infos.png` into a separated resource, in addition to other
resources stored in the `static` folder declared as resourceDirectory,
so it is easy to override.
[gbastien]