Expose 'inline' command to command line.
Inline available data and ignore missing files.
This function prints the available inline data to stdout.
To create inline files the data must be redirected to a file.
Internally, this redirection is taken care of.
Return 'soft' error when any data is missing but always print
available data.
This behaviour allows for incomplete inline files. For example,
when a CA signs a certificate but does not have the private key.
Any combination of missing files is allowed.
Signed-off-by: Richard T Bonhomme <tincantech@protonmail.com>