Synchronize master branch with lcg-105-compat (!752) · Merge requests · LHCb / Detector

Includes:

MP: Move to plugin based structure (!743 (merged))
cherry pick Muon-Chamber-Hit MR from master to lcg-105-compat (!745 (merged))
Make some sections of the corrugated foil thinner (!648 (merged))
Prepare Detector v2r6 (!718 (merged))
cherry picking the muon output level change from master branch (!715 (merged))
cherry pick 'mexu_run5_first_production_version' MR into 'lcg-105-compact' (!709 (merged))

Synchronize master branch with lcg-105-compat