Temporary Buydown feature improvements

Bring a number of improvements to the temporary buydown feature.

- Additional Scenarios (1-1-1, .05, etc)
- ARM option
- Automatically calculate the costs on behalf of the user so they do not need to manually do this. 
- Bring this feature to the Mobile App
- Temporary Buydown Partner Presentations & Open House Flyers
- Temporary Buydown information on the Current Loan 
- Product Templates w/ Temporary Buydown
- Interest Only Periods