Calculate labor for invoices

[krocodileteeth]

(this was brought up over the summer and would be great to implement ASAP) For invoices, it is currently the finance chair's responsibility to look at the Timecards page on tracker, review every runcrew/general labor's timecard, and then add the hours together based on their position (i.e. for concert, Chloe hours + Fletcher hours = LD hours). It would be great to have some fix that makes it easier/reduces manual labor:

The general concept is to match people who billed with their runcrew position for an event so that you can see labor hours for TiC, FoH, LD... for the entire event instead of names.

Another short fix would be to have the Tracker Admin > Timecards page show the person's name instead of their nickname. For example with HoTs, if we don't know someone's nickname, we have to have three tabs open to approve hours: the Members list, the Timecard page for the relevant week, and Workday.