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Bug fixes:

• The GHS wrapper now produces a more accurate compiler version ID, which prevents cached objects from being re-used between compilers with only minor version changes (e.g. a patched compiler vs a non-patched compiler).

Some minor fixes (thanks @benoit-pierre ):

• Debug traces are sent to stderr instead of stdout.
• A bunch of typos have been fixed.

• Fix regression: Core dump when not passing any arguments (terminate called after throwing an instance of 'std::logic_error').

• Make the Linux binary release run on Ubuntu 20.04 (again - it worked in earlier versions)

• Add a command line option to specify the location of the BuildCache directory (-d, --directory)
• Clarify the help text w.r.t. options vs commands

• Make the Linux release package work on Ubuntu 22.04 (drop dependency on libcrypto.so.1.1).
• Improve log messages for local and remote (redis) cache hits/misses.

• Run at most one housekeeping process at once.

• Delete stale lock files during housekeeping.

• Fix compilation errors on Ubuntu 18.04 (GCC 7.5).

• Add support for Redis AUTH.
• Add support for cc/c++ commands when they are copies of clang or gcc (fixes support on macOS when CC/CXX are undefined).
• Improve direct mode hash calculation (fixes direct mode under Visual Studio).
• Speed up direct mode for MSVC.
• Reduce memory footprint during housekeeping.
• Better handling of remote cache errors.