Ability to get input parameter via STDIN

[ahelmbr]

As described in README the password can be set via interactive input if a $ is used instead of a value.

Implement interactive input from STDIN

Example: pub -u test -pw $ -t xxx -m "my message"
$>>

[gitseti]

Why not omit the $ completely?

Example: pub -u test -pw -t xxx -m "my message"

This would be natively supported by picocli.

[ahelmbr]

Than lets do it like you proposed + change also the documentation

[gitseti]

Picocli seems to only support the interactive password option for jline3 which is not used here.

So I decided to write a small password converter which can support both options for now
con -u test -pw password
con -u test -pw $ -> prompts for password
con -u test -pw -> prompts for password

[gitseti]

Masking the input by using native java method System.console().readPassword() stops after reading the first typed character in a non IDE context.

Maybe collision with Jline2?

For now the password hast to be specified via ... -pw password

[gitseti]

Masking the input by using native java method System.console().readPassword() stops after reading the first typed character in a non IDE context.

Maybe collision with Jline2?

For now the password hast to be specified via ... -pw password

Upgrading jline2 to jline3 resolved this error
#25