Distance solution, move inline to .icc and use default.
requested to merge ATLAS-EGamma/athena:DistanceSolution_default_move_inline_to_icc_try_2 into master
Distance solution, move inline to .icc and use default. Also fix SCT_Digitization to used std::log, std::sqrt
Repeat of !39259 (merged) but trying to fix the SCT_Digitization issues. Mentioning @fwinkl and @ssnyder