- Provide a new API for sending text based email
  - Provide a migration and a listener for informing users about it

* Publish 'selectize' and 'xwiki-selectize' to the global RequireJS config ('xwiki-selectize' being part of the XWiki WAR)
* Modify attachment picker to use the standard 'xwiki-l10n' module and drop the need for Velocity code
* Update suggest* modules (that depend on 'xwiki-selectize') and update their usages (Velocity evaluation not needed anymore)

* Quick fix to emphasize the problem.

XWIKI-19902: Potential error log caused by not existing user during R140401000XWIKI15460 migration (#1873)

* XWIKI-19902: Potential error log caused by not existing user during R140401000XWIKI15460 migration

- Add a control for the existence of the user's wiki on org.xwiki.user.internal.document.DocumentUserManager.exists(org.xwiki.user.UserReference)
- When removing user's notifications in R140401000XWIKI15460DataMigration, verify if their is still notifications to remove before removing unknown user's notifications
- Introduce `UserException` in module `xwiki-platform-user-api`
- Allow `org.xwiki.user.UserManager.exists` to throw a `UserException`
- Take into account `xwiki-platform-user-api` in the rest of the codebase

* better dependencies organization

* used livetable for displaying attachments, like in AllAttachments page and reused macros of it
* remove the redirect done after attachment upload
* remove unused css
* updated attachments page object
* include missed office action and the new move action
* add a new action for viewing the history of an attachment, to replace the version column which was overloading the view
* add the possibility for external code to add attachment actions by using an ExtensionPoint
* display user with avatar for inside the attachments livetable and the AllAttachments page
* add a macro to be able to display a attachments livetable for a given document
* update attachments.css and use this class for AllAttachments page as well, to not duplicate code
* update updateCount to consider the case when we already know the number of attachments
* fixed the delete button which was not working when the attachments livetable was used outside the docextra and update tests for it
* add tests for filtering attachments and for checking filtering and delete action when multiple livetables are present on the page
* add a fallback for when XWiki.AllAttachments page does not exists, to have other filter options, when possible
* remove the, now unnecessary, # at the end of deleteURL
* small fix, forgot to change #displayAttachmentSize method call for AllAttachments livetable as well
* add workaround for tests until we move to livedata since the livetable filter will alter the fragment identifier and a page refresh will actually close the attachments tab

* Deprecate translation key `help.macroList.category` and introduce `help.macroList.categories`
* Update `XWikiSyntaxMacrosList` to display the list of categories of the macros (possibly overridden)
* Improve `XWikiSyntaxMacrosList` translations
* Introduce `getMacroCategories` in `RendringScriptService`
* Update the outdated documentation for the wiki macro categories override in `xwiki.properties`

XWIKI-19912: The tree on the Export modal doesn't have the context menu as the tree on the Export Wiki administration section

Add 'xwiki-platform-core/xwiki-platform-ckeditor/' from commit '6b105316'

git-subtree-dir: xwiki-platform-core/xwiki-platform-ckeditor
git-subtree-mainline: 0e1e4e94
git-subtree-split: 6b105316

* we still need the old event in the default WAR as the UI is part of the standard flavor

XWIKI-19931: Office format export options are not displayed anymore after installing PDF Export Application

* Cookies can be duplicated. The code shouldn't break when it happens. Also, it's good to log all cookies, even duplicated ones.

Fix scope of xwiki-commons-tool-test-simple in xwiki-platform-legacy-rendering-wikimacro-api.

- exclude dependencies we don't want in legacy mode

- Update the wiki macro xar files to use the new `defaultCategories` property
- Update the java macro to call `setDefaultCategories`
- Introduction of `xwiki-platform-legacy-rendering-wikimacro` and `xwiki-platform-legacy-rendering-wikimacro-store`
- Add an around aspect on `DefaultWikiMacroFactory.getDefaultCategories` to fallback to `defaultCategory` if no categories are found by the default implementation
- Move `WikiMacroConstants.MACRO_DEFAULT_CATEGORY_PROPERTY` to legacy
- Update `WikiMacroClassDocumentInitializer` to initialize `defaultCategories` instead of `defaultCategory`
- Add `xwiki-platform-legacy-rendering-wikimacro-store` to `xwiki-platform-distribution-war-legacydependencies`
- Move `org.xwiki.rendering.macro.wikibridge.WikiMacroDescriptor.Builder#defaultCategory` to legacy
- Move `WikiMacroDescriptor.getDefaultCategory` to legacy

* move EventStatusManager to legacy
* fix leftover dependencies

* fix deprecated call

* Revert test changes that were done in "XWIKI-19402: Upgrade to Tika
  2.3.0" due to changed behavior in Tika 2.3.0 that has been reverted
  now. See also issue XWIKI-19447.

This reverts commit adcc7715.