Add GetCounties to county database

- Also remove mutex, as the database is only modified on initialization

scwx-qt/source/scwx/qt/config/county_database.hpp

@@ -2,6 +2,7 @@
 
 #include <memory>
 #include <string>
+#include <unordered_map>
 #include <vector>
 
 namespace scwx
@@ -15,6 +16,8 @@ namespace CountyDatabase
 
 void        Initialize();
 std::string GetCountyName(const std::string& id);
+std::unordered_map<std::string, std::string>
+GetCounties(const std::string& state);
 
 } // namespace CountyDatabase
 } // namespace config