API browser changes:
- code cleanup
- added support for the new list_radius_accounts() method/function
- display current site (if selected) in top nav bar
API client class changes:
- IMPORTANT CHANGE: renamed all functions/methods named add_() to create_()
- improved data validation
- modified several existing methods/functions to leverage REST endpoints
- added create_network() method/function
- added set_networksettings_base() method/function
- added delete_network() method/function
- added list_radius_profiles() method/function
- added create_radius_account() method/function
- added set_radius_account_base() method/function
- added delete_radius_account() method/function