freedesktop.org/cppunit

[and-ri]

closed #557

[what-the-diff]

PR Summary

• Added a new file
  A new file has been introduced in this PR.
• Updated cppunit-config URL
  The URL of cppunit-config has been changed to a new location, dev-www.libreoffice.org/src/cppunit.
• Simplified version numbers
  Version numbers have been simplified to only include major, minor, and patch versions (e.g., 1_0_1) instead of full version numbers (e.g., 1_0_1rc4).
• Optimized build script for C++ unit tests
  The build script now utilizes hardware concurrency level to improve the build and installation process. Dependency tracking has been disabled as there are no dependencies involved in this project.
• Provided two freedesktop binaries
  Two binaries, bin/cppunit-config and bin/DllPlugInTester, have been made available, both belonging to the freedesktop organization within the repository structure.