Implement data format with extended meta-information

[hperrey]

For high-rate beam tests with asynchronous data streams between devices we need a data format that supports time-stamp meta-information; furthermore, the new data format should not rely on the "event" number (determined by trigger ID) but needs to allow trigger-ID/event counting, time-stamps, time-stamp ranges or any mixture of these.

Implication: For the online monitoring/analysis, these data streams would have to be synchronized first.

• These changes should not require modifications to existing producers as long as the old data-taking scheme is still allowed.
• Opening of binary files in the old format is not required (but would be nice) -- clear identification of new files and warning of the user if file format is not supported is a must however
• The specification for the new data format can be found at https://github.com/eudaq/plans-aida

[arummler]

@simonspa Is this not already implemented in the v2 branch?