Enhance date handling to support scenarios involving mathematical calculations.

[mikemitchel]

Because all dates are integers, this can create issues when a date calculation is required for completion of a court form or other document. For example, if the deadline to file a court form is one year from a date entered by a user in the Guided Pathway, the date would be calculated by adding 365. However, if the time between the two dates includes a leap year, the calculation will be inaccurate. This problem also occurs with calculations based on months, given the different length of each month. Currently, CLEO can manually build logic to address these issues, but there is a significant potential for errors and the logic quickly becomes complex. The use of number strings for dates, rather than integers, would assist with this issue.