GitLab

- Integrated changes to the stop mechanism
- Also re-worked the interface to have the same execOn* methods as Sensor Groups

- Decoupled the stop() and wait() methods
- A stop command is issued to all sensor groups, then a wait is performed
- Wait() now does busy waiting at a 10ms frequency and times out based
on the interval of the sensor group

- use std::atomic_flag based spin lock for thread safety
- minor fixes and improvements

- Update/improve doxygen documentation
- Unify function name scheme of entity with SensorGroups
- Squash some TODOs

- Adapt Configurators:
  *Introduce partial template specialization in ConfiguratorTemplate
  *Move common logic to ConfiguratorInterface
  *Update and improve doxygen documentation
  *Adapt all plugin configurators
- Refactor printConfig of SensorGroups
- Minor improvements overall

- make use of new EntityInterface
- _keepRunning is now a bool
- extend and improve (doxygen) documentation

- Added some more indentation to make the configurations more readable
- Fixed one more warning in dcdbquery

- Added a 'common' directory where all shared code has been placed
- Analytics package has been moved out of dcdbpusher, now has its own makefile
- Some renaming here and there for uniformity