tmf: Add Show Markers menu for time graph viewer

tmf: Add Show Markers menu for time graph viewer

Support the dynamic Show Markers menu in time graph viewer that contains
a checked action for each of: Bookmarks category, view-specific marker
categories, and trace-specific marker categories for the current trace.

Add the menu to the abstract time graph view's view menu.

Hide markers of categories that are unchecked in the Show Markers menu.
This will also make them ignored in Next/Previous Marker navigation.

Change-Id: I31c0ee983c217a149070f8628a162fc7420222d6
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/59072
Reviewed-by: Hudson CI