XWIKI-10165: Hide the content bar when asked

* Take into account the value of '$displayContentMenu' in 'edit' mode
XWIKI-10154: Implement edit mode in Flamingo.
XWIKI-10093: Implement view mode of the Flamingo skin.
XWIKI-10154: Implement edit mode in Flamingo.

* Re-organize the LESS files of the skin.
XWIKI-10167: Add BlockReference to reference structured part of the content of a document or an object property.
XWIKI-10165: Hide the content bar when asked

* Create and use the '$displayEditMenu' for this purpose
XWIKI-9595: Ask confirmation for pages not needed anymore before deleting them
* Add script API to create an uninstall request in order to be able to uninstall an extension in non-interactive mode (required by extension tests).
XWIKI-10154: Implement edit mode in Flamingo.

* Support inline mode.
* Support "object is currently locked".
XWIKI-10093: Implement view mode of the Flamingo skin.
XWIKI-10154: Implement edit mode in Flamingo.

* Misc stuff (xforms, sizing, livetable, ...).
[misc] Fix parent
XWIKI-10168: Source metadata should be set to a document reference after parsing any content related to a document
XWIKI-10168: Source metadata should be set to a document reference after parsing any content related to a document

Fix a unit test that was indirectly impacted by the added dependency to xwiki-platform-rendering-xwiki into xwiki-platform-display-api, since this test was using @AllComponent which now register XWikiLinkLabelGenerator with more priority than DefaultLinkLabelGenerator and require the injection of a DocumentReferenceResolver that is missing.
[misc] Apply the new XAR format.
XWIKI-10171: The menu displays an error if the current user doesn't have access to the document defining the menu
* Check if the current user has view access to the document defining the menu.
XWIKI-10174: Polish Flamingo view mode.
[misc] Remove useless code
XWIKI-10173: Changing translation document author is not taken into account
XWIKI-10155: Implement admin view in Flamingo.
XWIKI-10177: Possible nullpoiter exception when acessing subwiki before main wiki
XWIKI-10178: Invalid use of the "inline" action in User Profile.
XWIKI-10179: Fix user profile in Flamingo.

* .half class, avatars...