tmf: Add a TextTraceEventTable for text traces

tmf: Add a TextTraceEventTable for text traces

Current text trace implementation store all their information (timestamp,
type, event content, etc.) as ITmfEventField's. Provide a standard
TextTraceEventTable implementation which simply displays the contents of
the event fields, one per column.

Change-Id: I20989a479827f899edfa7289f6f9456cea2637f7
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/26312
Tested-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>