Bind country dashboard and infection trajectories state to url to allow sharing url

[m3h0w]

Bind country dashboard and infection trajectories state to url to allow sharing URL. Pass a list of countries in the infection trajectories and country + region in country dashboard.

[m3h0w]

This has been partially done. Works for country dashboard now, but still haven't done it for the infection trajectories (right now putting a country name after '/' will make sure that that country is added to the list but I'd hope that the URL would contain a list of all added countries or integers that map to countries somehow so that the URL can be shared)