[Maintenance] Update APD and Budget schemas to store only integers

[thetif]

Description and related issues

There is a little confusion with displaying some values and budget calculations because they are being converted from int to float and back again (for instance dealing with percents). To avoid this confusion, all of the values stored in APD and Budget should be stored as whole numbers. Any conversion that needs to be made to floats should only be made in the budget calculation utility and then converted back to an int before being stored.

This task is done when…

• [ ] the APD and Budget schemas only store whole numbers
• [ ] the budget calculation utility handles all of the conversion to floats that are necessary