Create testing boilerplate for all libraries / packages

[lobis]

After #129 we have introduced (as an optional dependency) the google testing framework into REST.

Now we need to add the boiler plate and some basic unit tests so that users can start writing tests.

• DetectorLib: Formatting and added boilerplate for testing detectorlib#42
• Geant4Lib: Add boilerplate for testing and basic tests geant4lib#38
• RawLib: Added testing boilerplate, basic tests and global formatting rawlib#51