Refactor "Site Manager" to "Forest Steward" to match business design

[Samuel-Therrien-Beslogic]

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Closes #238
This also improves the use of StrEnums in Python

[andy2great]

Like the other project should we just consider redoing the db and handle migration later?

[Samuel-Therrien-Beslogic]

We've been squashing the migrations and nuking the DB out of lazyness/simplicity when it would require doing a manual migration script.

These should work just fine as is