Update storage module to persist security tier and salt

[ropeadope62]

Implements part of #1 (configurable security tiers)

Changes to storage.py

• Update initialize() to accept tier parameter
• Generate and store salt for non-standard tiers
• Bump .secrets version to 1.1
• Add get_security_tier() method
• Add get_salt() method
• Add create_crypto() convenience method that builds ZeroEnvCrypto with correct tier/salt
• Add get_project_info() method for the info command

Testing

1. Standard tier does not store salt
2. Enhanced/paranoid tiers store salt
3. create_crypto() returns correctly configured instance
4. Backward compatible with v1.0 files (defaults to standard tier)