Collective.iconifiedcategory

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- Added `get_` and `set_` methods for settings registry records in `config.py`.
[gbastien]

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- Fixed `CategorizedObjectPreviewAdapter.status` when an existing element is updated.
[gbastien]

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- Simplified `CategorizedChildView.has_elements_to_show`.
[gbastien]

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- Fixed version (2105) in `metadata.xml`.
[gbastien]

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- Display the document conversion spinner in any relevant case.
[gbastien]
- Added `contentType` value to the `categorized_elements` data.
[gbastien]

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- Added new field `ICategorize.show_preview` to turn link to element to a
`collective.documentviewer` preview instead download.
Fixed icon displayed when preview computation in progress.
[gbastien]
- Force icon `width/height` to `16px` in `tooltipster`
(`categorized-childs.pt` and `categorized-childs-infos.pt`).
[gbastien]
- Fixed `ContentCategory` portal_type title in `ContentCategory.xml`.
[gbastien]