tmf: Add list methods for trace package elements

Change-Id: I614f283cb6c5d60789cfa16acbd7dee706d2ec8c
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/37300
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Hudson CI
tmf: Bug 451240: Mouse wheel inactive on time graph scale and scroll bar

- Add a mouse wheel listener to the time graph scale to zoom

- Remove the mouse wheel event filter that was added when time graph
control had focus, and replace it with a listener to prevent horizontal
scrolling on mouse wheel events.

Change-Id: I5cdb189359fee675353e077daf81f8452958a30e
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/36419
Tested-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>