Cleaner organization of Admin forms for Country, Region, Emergency

[batpad]

Breaking out of #1621 -

As we have continued to add more fields and functionality to these forms in the backend, the forms have grown a bit disorganized and confusing for users.

We should think of a clear hierarchy and sections for each of these forms, and then organize the forms in the admin into "fieldsets" with clearer section labels and guidance.

The simplest would likely be to group various fields into "fieldsets" and have clear, easy groupings.

This is for backlog right now, but will likely be good to take up soon, before we add more complexity to these objects in the admin.

cc @tovari

[laurencun]

@batpad Happy to start on this issue if assistance is still needed.