Overhaul Tracking

[erichte-ibm]

There is a lot of work needed for the guest secure boot support. This work will be done in the guest-devel branch. All other branches appear to be obsolete and should be deleted after this work is merged.

Current known items needed to be fixed:

• rewrite build system
• re-implement cmake build (for packaging, mostly)
• reformat entire tree in accordance to style guide
• reorganize source directories in a more sensible way
• remove excessive prints to stdout
• reconcile crypto backend differences with libstb-secvar
  • move probably all crypto code into libstb-secvar
• re-enable and improve CI

Post 2.0:

• properly factor out common code between the backends
• rework tests probably

[erichte-ibm]

Copy-pasting outstanding items from PR #42

• libstb secvar only supports openssl
• move all crypto files into libstb-secvar
• backend specific builds fail (this support should be dropped)
• crypto_write_only is uselless and should be removed
• review the common/ directory
• fix various memcmp with strlen uses
• make memcheck is failing due to memory leaks

release related:

• resolve version scheme (where to store version number in repo)
• implement --version
• add supported modes output