Add configurable mismatch score to TitleMatchingItemScorer

When the title classifications match in the TitleMatchingItemScorer
but the titles themselve do not return a configurable score rather
than `Score.NULL_SCORE`. The default configuration is
`Score.NULL_SCORE`.

If the title classfications do not match then the result is still
Score.NULL_SCORE.
Add BroadcastItemTitleScorer to YV and Redux equiv updaters

YouView and Redux items are all single broadcast items which often
inherit their titles directly from their brands. The
BroadcastItemTitleScorer will resolve and check the title of an item's
brand if the candidate equivalent's title doesn't match. It will also
resolve and check the candidate's brand title if necessary.
Score -1 for YV Item broadcast title equivalence mismatches
Merge pull request #334 from atlasapi/mbst-6414-broadcast-item-scorer

MBST-6414 Broadcast Item title scorer