Add magfield and test data as git submdules #2296

Job	Run time
validation / GitHub context	4s
validation / Dependency info	5s
validation / Build coatjava	2m 14s
validation / Configuration files	10s
validation / Event generation (e_n)	1m 59s
validation / Event generation (e_pC)	1m 42s
validation / Event generation (e_g)	59s
validation / Event generation (eFT_K)	56s
validation / Event generation (e_p)	58s
validation / Event generation (e_gFT)	1m 1s
validation / Run (e_p, rgb_fall2019)	1m 58s
validation / Run (e_n, rgb_fall2019)	1m 58s
validation / Run (e_g, rgb_fall2019)	1m 58s
validation / Run (e_gFT, rgb_fall2019)	1m 58s
validation / Run (e_pC, rgb_fall2019)	2m 0s
validation / Run (eFT_K, rgb_fall2019)	1m 59s
validation / Report multiplicity	1s
validation / Report efficiency	1s
	22m 1s

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