Third step with dummy btagging

Opening WIP MR for discussing this.

Description: Addition of third step in the b-jet triggers. This is a dummy sequence since it does not actually compute b-tagging and does not cut on it (the hypo tool passes all the events). The TrigBtagFexMT will be replaced with the offline algorithms.

Also, in this MR Primary Vertex and Precision tracks are attached to navigation.

Tagging @cschiavi, @tamartin, @fpastore and @tbold