[obfuscxx] Add new port

[nevergiveupcpp]

Add new header-only port for obfuscxx - compile-time variables obfuscation library for C++20.

• Changes comply with the maintainer guide.
• The packaged project shows strong association with the chosen port name.
  • The project is amongst the first web search results for "obfuscxx" or "obfuscxx C++".
• Optional dependencies of the build are all controlled by the port.
• The versioning scheme in vcpkg.json matches what upstream says.
• The license declaration in vcpkg.json matches what upstream says.
• The installed as the "copyright" file matches what upstream says.
• The source code of the component installed comes from an authoritative source.
• The generated "usage text" is brief and accurate.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Exactly one version is added in each modified versions file.