Fiftlib versioning property naming

[mrbonezy]

• funcFiftLibCommitHash - consider renaming to fiftlibVersion
  • Is it reliant on FunC in some way? (especially since it's used by fift and not FunC) - if not, perhaps better to remove func from the property name
  • commitHash -> version - in case fiftlib gets semantic versioning the field can be used for that in the future. until then using the commit hash as the version could make sense
• funcFiftLibCommitDate - is the commit hash not sufficient to identify the correct fiftlib version?
• fift also has its own version - shouldn't we add that as well?