cbmreco: Add support to store results to file

Adds rudimentary support to store reconstruction results via cbmreco:

• Adds RecoIO class that contains results from one pass of the reconstruction (called IO as i plan to use it as possible input to reconstruction in addition to timeslices)
• Add Archive class to store one or more reconstructed timeslices to file
• Add --output flag to specify output-file, and add --write-per-timeslice flag to write results once per each timeslice.