LLICF v1.5.1
  - Added with add_subdirectory or FetchContent, LLICF builds the library only; the tools,
    tests and Python bindings are on by default only at the top level
  - Builds against an LLIC source tree the project has added before it, as the project
    built it, instead of fetching another; LLIC's options are no longer written to the cache
  - MSVC C4701 in RelWithDebInfo builds fixed
  - The API stays 1.5 and the format is as in 1.4

See CHANGELOG.md for more details.