Sentinel - Change Log

[0.0.2] Implement the three sentinels

MAID-1061 Move Frequency back here into this crate
MAID-1074 Remove dependency on the custom fork of the sodiumdioxide library
MAID-1022 Implement KeyStore
MAID-1023 Test KeyStore
MAID-1024 Implement PureSentinel
MAID-1025 Test PureSentinel
MAID-1026 Implement AccountSentinel
MAID-1027 Test AccountSentinel
MAID-1030 Implement KeySentinel
MAID-1031 Test KeySentinel

[0.0.0 - 0.0.1]

Reference implementation for the PureSentinel