fdo#85945 reorganize the file menu and set global shortcut for .uno:CloseDoc

Change-Id: Idca217184719eb7c5679af65f9ab1536d615c284
Reviewed-on: https://gerrit.libreoffice.org/13571
Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>