Keyring API

[richburdon]

• [ ] Normalize method names (e.g., -Key or -KeyRecord suffix; some like findTrusted has no suffix); pref all return types to be KeyRecord, but API is -Key
• [ ] Remove replicated functions (e.g., remove keys getter since same as findKeys)
• [ ] findTrusted requires a keychain object but is not static
• [ ] Generally deprecate static methods (anti-pattern) where practical