CMake Re-Write, master branch (2025.01.30.)

Triggered by atlas/atlasexternals!1199 (merged), I tried to make the configuration of the project simpler, while moving the configuration of the tests and the examples into separate files.

• Renamed the exported project from CrestApiLib to CrestApi. So that the installed library's name would be CrestApi::CrestApiLib.
• Changed the names of the macros in CrestApi/version.h. So that they would not so easily clash with macros coming from other projects.

Note that you guys have some dead code in the repository... 😦 One of the tests fails (but at least successfully compiles), and one of the examples doesn't compile. Those ones I commented in the new CMake configuration... 🤔