Add --passwd to support piping password via stdin #13
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This adds a new command-line flag --passwd that can be set to either "getpass" (current behavior and still default) or "stdin". Specifying "stdin" takes the password straight from stdin without prompting or requiring a tty, and causes prevents any other interactive prompts from happening.
The purpose of this is to allow scripted use of alohomora, where the password is collected from some other programmatic source, such as lpass-cli or similar.