Event loader HDF5
This MR adds an event loader to read hdf5 files as used in many python-based DAQ systems (bdaq53, tj-monopix2-daq, lf-monopix2-daq, telepix_daq). It is able to define events based on timestamps and to add hits to events based on timestamp or trigger matching.
At the moment, it lacks support for floating-point charge values and requires the input file to be pre-formatted according to the readme. While it adds an additional step to the analysis, the module as such can be used for a multitude of detectors. Compression filters are also not supported (yet).