Allow Overwriting of Detector Parameters from Commandline

See merge request !76

Need to also update the manager and how we interface it.

fixing 2 memory leaks

See merge request !75

script to setup environment for lxplus

See merge request !74

updated manual wrt: data-driver functionality tests

See merge request !73

Add SIGTERM interrupt handler to gracefully exit (allows to store data if job is killed)

See merge request !72

Add Testing to CI

Closes #40

See merge request !71

Manual: add description of CI and testing, mainly based on the respective Allpix Squared documentation