MdtCalibT0 - remove mutable data-members & package reformatting

Johannes Junggeburthrequested to merge
(removed):ATLASRECTS-6177 into master

Hi,

although the changes in this MR look huge at the first glance, the essential ones are quite minor in the MdtRelativeTubeT0 where I removed the mutable data-member and declared the class methods as non-const. The rest of the changes are reindentation of the package for better readability in the future.

Cheers,

Johannes

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