DACPP Open Source v0.1.0

Initial open-source release of DACPP.

Highlights:

• DACPP source-to-source translator built on LLVM/Clang.
• Non-MPI translation through the single-node translator path.
• MPI translation support with SYCL output.
• Public setenv.sh and dacpp.sh scripts for environment setup, translation, and compilation.
• Example DACPP and MPI/SYCL programs under clang/tools/translator/example.