Cleanup track sorting

This (finally) removes the track sorting code that relied on adding decorations to tracks. These decorations were especially ugly in that the track sorting depends on both the track and jet parameters: they become incorrect if the same track is ever associated to multiple jets. In practice this wasn't such an issue because we only ran on one jet collection at a time.

The other benefit is that we no longer add decorations for every possible sort method. This means we depend on fewer track parameters (e.g. the btagging specific impact parameters) if we don't need them.