Main

Replace boost::filesystem with std::filesystem. Replace
boost::program_options with CLI11. Rename ProtectedAndSynchronizedQueue
to ProtectedQueue. Fix error with JPEG_REGEX. Bump version to v0.5.0.

Update PCA CMakeLists.txt. Build libpackjpg as a dependent external
project.

Correcting CMake shared/static library syntax.

Correct library install source file path.

Correct installation of static library.

Correct library header install path.

Removing leading slash from install paths.

Use computed library path for install.

Adding libpackjpg statis library target.

Modernize packJPG CMakeLists.txt. Remove Boost dependency.