Roles/File: align params in attributes
IndexDB: close #144; add timers around add_[wad|zip]file()
wadindex: issue #144; read DB add time from DB object

- Change the variable names of the "DB add" status objects to make them less
  confusing
wadindex/WADIndexer: close #143: run a timer on index_wad()

- When `index_wad()` is run, it times itself, and keeps the time value
  difference in a new attribute `wad_index_time`
WADIndexer: issue #143; track total time in index_wad_list()
wadindex/ZipFile: close #142: track time spent in extract_files()