Move page before Editor is shown

The editor is pointing to the wrong location since the remapping is done on save. This is due to the fact that we need to access the page. But we really do only access the space key and require the page only for remapping. Maybe we could replace de.smartics.projectdoc.atlassian.confluence.ProjectDocDocumentEventListener by a subclass of com.atlassian.confluence.plugins.createcontent.api.contextproviders.AbstractBlueprintContextProvider, if this would correct the page automatically. This would also make the move less error prone (since we have no real documentation for this).