Changes For AppDateRange + Context Changes

[shimcup]

Hello,

I worked on persisting the "checkIn" and "checkout" fields with the current library "react-date-range".

^Still figuring out how the styles are written among components, so I should be able to fix the look once I do, but you can see that the dates picked are shown in the searchBar, which is using the values from DataContext.

Please let me know if I can provide additional information.

Thank you, Simon