XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Fix bug.
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Perform a better migration of Workspace Candidacies.
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Remove useless injects!
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Migration of Workspaces: Add the restoration of pages that was previously deleted by WorkspaceManager.Install.
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Migration of Workspaces: Add the restoration of pages that was previously deleted by WorkspaceManager.Install.
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Migration of Workspaces: Fix tests.
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Migration of Workspaces: Fix style
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Migration of Workspaces: Add the restoration of pages that was previously deleted by WorkspaceManager.Install.
Merge remote-tracking branch 'upstream/master' into new-wiki-api

Conflicts:
	xwiki-platform-core/xwiki-platform-wiki/xwiki-platform-wiki-user/xwiki-platform-wiki-user-default/src/main/java/org/xwiki/wiki/user/internal/WikiUserClassDocumentInitializer.java
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Migration of Workspaces: Add the restoration of pages that was previously deleted by WorkspaceManager.Install (bug fix).
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Migration of Workspaces: Add the restoration of pages that was previously deleted by WorkspaceManager.Install (bug fix).
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Migration of Workspaces: Bug fix.
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Fix descriptor cache bug.
* Add extension names in POMs.
Merge remote-tracking branch 'upstream/master' into XWIKI-9693
Merge remote-tracking branch 'upstream/master' into XWIKI-9693
XWIKI-9693: When creating a subwiki, the Activity Stream should be empty.

* Add WikiProvisioningEvent, WikiProvisionedEvent and WikiProvisioningFailedEvent.
* TemplateWikiProvisioningJob now notifies these new events.
* XARImportingEvent implements now BeginFoldEvent (so that the importing of a XAR does not make events in the AS anymore).
XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Fix migrator.
Merge remote-tracking branch 'upstream/master' into XWIKI-9693
XWIKI-9695: Describe the Workspaces Macro and the Workspace Panel as deprecated.
XWIKI-9736: The "wikis" section of the user profile is missing.