Allow us to dig deeper and know where our time is used in "Statistics."

E.g.

1. Click a project, then see which tasks were associated to that project to see where the time went.

2. Click an event category (Internal, External, Solo Events), and see which events added up to the time used.

3. Allow certain calendars to be excluded (e.g. I don't need the statistics to count the hours in an NFL game because I subscribe to my team's calendar.