HSEARCH-1455

Cleanup of deprecations. The changes in this pull request should be save to apply imo. 

Where I am still a bit unsure (no changes made so far):

   * DocumentBuilderHelper#extractObjectFromFieldable
   * DocumentBuilderHelper#extractStringFromFieldable
   * LuceneWorkHydrator#addFieldWithBinaryData
   * LuceneWorksBuilder#addFieldWithBinaryData

These deprecations were introduced during the Lucene 4 migration, but it seems they are more TODO pointers than actual deprecations. Thoughts?