Adding mdat back
Created by: mattclarke
Issue
ECDC-3447
Description of work
Re-added the mdat module, but made it "standalone" as it doesn't work like a standard module. In the spirit of YAGNI, it only deals with start and stop times. Can be made more generic if required at a later date.
Checklist
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Changes have been documented in changes.md -
Documentation has been updated in documentationdirectory