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By default, ssh-agent stores identities forever. It has an option to
set a maximum lifetime for identites (useful to expire passphrase protected
keys). Allow this option to be set using:

zstyle :omz:plugins:ssh-agent lifetime <time>

Reorganizing plugins so that each plugin has it's own directory now so that any plugin-specific functions can be bundled within there.

Implement a simple module that automatically launches the ssh-agent when you login and
adds your default key.

Useful for anyone that does remote work and thus doesn't have access to a keychain tool.