CMS-3764 Replace ExtJS grid - Last task - when everything works - remove the old grid

Reorganized content-manager module structure.
Replaced old grid usage from the ContentBrowsePanel.
Merge branch 'master' into CMS-3764
Merge branch 'master' into CMS-3764
CMS-3765 Replace ExtJS grid - Try move the new TreeGrid to api.ui.treegrid

Fixed updates for the deleted items.
CMS-3764 Replace ExtJS grid - Last task - when everything works - remove the old grid

Added refresh method for the future use.
CMS-3764 Replace ExtJS grid - Last task - when everything works - remove the old grid

Updated tree grid filtering.
Merge pull request #850 from enonic/CMS-3764

CMS-3764 Replace ExtJS grid - Last task - when everything works - remove the old grid