tmf: Highlight search and filter keywords in events table

tmf: Highlight search and filter keywords in events table

Highlight in yellow background the search or filter keywords used in
column filters, based on the current header state.

Fixes a bug in Linux where colored rows would override the default
platform theme background forever (e.g. alternating colors).

Fixes a bug in Windows where the item background color would not be
shown under a table item's image transparency.

Fixes a bug in Windows where the item background color would not be
shown under a selected or hot (ie. under the cursor) table item.

Change-Id: I31847552613e3e5bdf8c0160d90acca833d76501
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/43750
Reviewed-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>