[538129] Control Project Explorer filters and content through preferences

Configure ListHandlerFactories for ProjectExplorer preferences.

Also fixes a broken key pattern in cases where no key/value pairs are
used (pattern needs a match group to work)

Change-Id: If3a2578291497ba0f8768e4a2c97961c861be891
Signed-off-by: Carsten Reckord <reckord@yatta.de>
1 file changed