Replaced ajax get with fetch API and updated the tests. I also split out the calls to FIM from the calls to get flood levels from waterwatch and also did some renaming to remove waterwatch from our code. We will almost certainly be getting flood levels somewhere else in the future.

Updated test to work with the changes made to separate initial rendering from updates when data is loaded/changed.

Added a hack to clear the USWDS date picker when using the shortcut buttons. All tests are passing but still need to add tests for days-before-shortcuts.

All tests are now working. the download-links module tests were completely revamp since the UI works in a very different way now.

Fixed tests as the hydrograph state is now set regardless of whether the showOnlyGraph is set to true.

Need to set the selectedIVMethodID regardless of whether showOnlyGraph is true or false. This will fix the issue with WDFN-504.

Made the fetching functions a little less brittle and updated some of the hydrograph rendering tests.

Removed no longer needed code and updated the store and selectors for the new hydrographData and hydrographState properties

how to bring in a non-ES6 module or figure out how to import Leaflet.