Re-implements slider on simple view.  It was a bad design decision to remove this.
Adds a delete button to financial snapshots, makes expand/collapse functional.
Makes the delete snapshot button functional.
Adds comment documentation for the delete snapshot functions.
Fixes some typos and styling issues.
Moves a bulk of logic onto each financial snapshot.
Separates simple and advanced tab logic.
Adds some styling to collapse and delete buttons.
Makes new principal equal portfolio value at that point in time.
Fixes quick facts by using averages across all financial snapshots.  Removes years until financially independent as it no longer makes sense.
Adds some styling to header, background, and footer.