Functional model rewrite, better handling of bad XLSX files

• fixed some address problems
• rewrote the whole model to use the functional programming paradigm
• added sorting to loaded jobsheets in the table (sorted by most recent date, then alphabetically)
• fixed a race condition causing the table to not display new data occasionally
• locked the refresh button while data loading is in progress
• fixed some progress bar issues
• disabled the "consume input files" option as it is not functioning at the moment due to the model rewrite