* Update helpcontent2 from branch 'master'
  - Untangle Help Contents for Impress and Draw
    
    Create a separated sdraw.tree for Contents and move entries
    from Impress tree to Draw tree.
    
    Common contents are maintained in both trees.
    
    This is work in progress. Draw and Impress Help pages need update
    especially for menus.
    
    Change-Id: I179a5ee7407c4a8357a87b2e7a0d8782b7bb0520
    Reviewed-on: https://gerrit.libreoffice.org/72693
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>