Magnetic Field Elements : Move more inline methods to the respective .icc files

Move inline methods to the respective .icc files.

This merge request affects 1 package:

• MagneticField/MagFieldElements

added Magnets master review-pending-level-1 labels

CI Result SUCCESS (hash b25c36af)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 20104]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 958225f2

added sweep:ignore label