Inward efficiency of masks

Update from references:

• https://doi.org/10.1080/02786826.2021.1890687
• https://doi.org/10.1016/j.jhin.2013.02.007
• https://doi.org/10.4209/aaqr.2020.08.0531

the inward efficiency of masks follows now a uniform distribution.

https://gitlab.cern.ch/cara/cara/-/issues/184 Update 5 - "Improve the inward efficiency of masks, currently it is a constant value."