tmf: Make processes and threads optional in Call Stack view

tmf: Make processes and threads optional in Call Stack view

- Update call stack analysis module to support possibly empty processes
pattern and threads pattern.

- Update call stack view tree structure to make process entries and
thread entries optional.

- Add icon for process entries.

- Incorporate update of call stack entry selection into
synchingToTime().

- Update synchingToTime() to use a recursive Consumer and to use cached
full states.

Change-Id: I1f850186e04f2470c8e4889c6396217373e7f923
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/71823
Reviewed-by: Hudson CI