Close trace and improve error handling on delete and rename commands

Close trace and improve error handling on delete and rename commands

- Close trace or experiment editor on delete and rename commands, to
dispose the trace(s) and release file resources to allow the file
operations to succeed
- Show message dialog to user on delete error
- Fix message dialog for rename error
- Move creation of bookmarks file to trace or experiment element
- Fix leaking of project model elements

Change-Id: I585df4fd4b3547dc4b71735ebbd47184585c0eef
Reviewed-on: https://git.eclipse.org/r/9339
Tested-by: Hudson CI
Reviewed-by: Bernd Hufmann <bhufmann@gmail.com>
IP-Clean: Bernd Hufmann <bhufmann@gmail.com>
Tested-by: Bernd Hufmann <bhufmann@gmail.com>
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>