Rework the beginning of the end-week sequence:

1. Replace endWeek.tw with a closed function in endWeek.js, executed directly when "END WEEK" is clicked, to remove a passage transition
2. Display the Load Screen until the Slave Assignment Report has run to completion, so it doesn't look like FC has just frozen
3. Move end-week confirmation javascript out of storyCaptionWidgets.tw and into endWeek.js, because javascript belongs in javascript files, not in <<script>> tags
4. Get rid of the $shelterGirlIDs global array...the inspection event only uses one girl, and the dynamic equivalent is easy (use $slaves.filter(isShelterGirl))