Update status output format

[jmwilson]

Update the status output format with some improvements for brevity and understanding:

1. move the vendor and product info to a single line following the device name. These fields in scsiencrypt.h are now declared with std::array to make it a one-liner in modern C++ to rtrim and print them.
2. replace Drive input: Encrypting with Writing: Encrypting and Drive output: Decrypting with Reading: Encrypting. This better matches how a tape drive is typically used in a UNIX command or pipe (since "Drive input" refers the action that is done when the drive is used as the output file of command such as dd if=src of=/dev/nst0)
3. change Volume Encryption: Encrypted to Current block status: Encrypted. "Volume" is not a term used in mt or other tape programs. The SCSI data is being printed is actually called "next block encryption status" since it refers to the block following the current tape position.
4. Print algorithm name (e.g. AES-256-GCM-128) instead of the algorithm index where possible.

Other changes:

1. update README to reflect new output
2. test file output.cpp updated for new output
3. reduce code duplication in scsiencrypt.cpp debug output with a new function print_buffer. Including in this PR to reduce merge conflicts.

Follow-on PR with fixing include headers using include-what-you-use to follow.