FEATURE REQUEST - full SNMP V3 implementation

ref. Case # - 01127824

SNMP V3 authentication is not fully implemented.

Since SNMP V1 is obsolete, recommendation to abandon V1 in favor of V3 are getting quite common.

1. in "private password", cannot specify different passwords for SNMP "authentication" and "encryption"
2. in "algorithms (right)"cannot use AES512 or higher, only AES is provided
3. In "security level", cannot separate "authentication" and "privacy"
4. in algorithms (left side), SHA265 and SHA512 are not available

thanks