442326 Added ability to view file contents in Folder context

Also:
- fixed opening files in Workspace context
- changed file/folder icons in Workspace and Folder contexts
- changed double click behavior: not rename, but open file or expand folder
- added Rename button to Workspace and Folder contexts

Signed-off-by: Mixail Bobylev <mixail.bobylev@xored.com>
17 files changed